So, why would a species like the banded mongoose favor breeding between relatives? |
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The critters have the propensity to devour their babies if alarmed and so require a calm environment for breeding. |
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Its adaptability and breeding capabilities ensured that it would be selected for mass production on an unimaginable scale. |
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Elis: Ancient Greek region and city-state in the northwestern corner of the Peloponnese, well known for its horse breeding and for the Olympic Games. |
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After describing the effects of modern dressage, breeding, and business, the author suggests a classical alternative i.e. the philosophy of "legerity." |
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She believes that we are breeding a generation of children who know nothing about the history of their country. |
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The whales migrate between their feeding ground in the north and their breeding ground in the Caribbean. |
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We've never had any cause to split up,'' said Chris, who splits his time between touring with The Real Thing and breeding champion Afghan hounds. |
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If held as a colony outside the breeding season, antechinus show relatively little aggression while still forming a linear hierarchy. |
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This book is the world's most authoritative guide to insect breeding habits. |
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Through genetic manipulation and harsh training, I am breeding a species of super-dogs to take over the world. |
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Davies meticulously establishes the background, the breeding in the bone, of his hero's life. |
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The rock dove is often found in pairs in the breeding season but is usually gregarious. |
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Younger birds are smaller, males are larger during the winter, and females are larger during the breeding season. |
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This call is also used by females in the breeding season, to establish dominance over males while displacing them to feed young or incubate eggs. |
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Some birds breeding for the first time in tropical areas are only a few months old and still have juvenile plumage. |
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Males take up nesting sites before the breeding season, by frequently calling beside them. |
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Lost mates of both sexes can be replaced quickly during the breeding season. |
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In open nesting sites, breeding success tends to be lower, since breeding begins late and the nest can easily be destroyed or damaged by storms. |
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Clutch size is also affected by environmental and seasonal conditions, female age, and breeding density. |
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The length of the incubation period decreases as ambient temperature increases later in the breeding season. |
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Common pheasants are gregarious birds and outside the breeding season form loose flocks. |
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In some cases, the female is dominant over the male in breeding behavior, which can result in females that are larger than the males. |
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In wet weather, they cannot hunt and this may be disastrous during the breeding season. |
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Outside the breeding season, common frogs live a solitary life in damp places near ponds or marshes or in long grass. |
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At breeding time, the male develops nuptial pads on the first three fingers. |
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The common toad emerges from hibernation in spring and there is a mass migration towards the breeding sites. |
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Some females that were on a biennial breeding cycle carried on growing rapidly for a longer time. |
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Many toads are killed by traffic while migrating to their breeding grounds. |
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More recently, Field Elms Ulmus minor highly resistant to DED have been discovered in Spain, and form the basis of a major breeding programme. |
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In 2010, the fruit's genome was sequenced as part of research on disease control and selective breeding in apple production. |
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Understanding the genes behind these characteristics will allow scientists to perform more knowledgeable selective breeding. |
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Primrose breeding of named coloured varieties became popular in the nineteenth and early twentieth century. |
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This breeding system may enable successful reproduction in harsh environments. |
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It is a major breeding ground of harp seal and hooded seal that has been used for seal hunting for more than 200 years. |
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It is a major breeding ground for seals, including harp seal, hooded seal and gray seal. |
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The island has been designated as an Important Bird Area by BirdLife International because of its importance as a breeding ground for seabirds. |
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At breeding time, the male courts the female by following her around closely. |
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The husky dog breed comes from Inuit breeding of dogs and wolves for transportation. |
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Little is known about their breeding except their spawning is seasonal, although its timing varies somewhat with location. |
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Sea lions, with three groups of pinnipeds, have multiple breeding methods and habits over their families but they remain relatively universal. |
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Their seasonal abundance trend correlates with their breeding period between the austral summer of January to March. |
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At the end of the breeding period males disseminate for food and rest while females remain for nurturing. |
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Turtles can take many years to reach breeding age, and in many cases, breed every few years rather than annually. |
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A breeding season can take over a year from laying to fledging, with a single egg laid in each breeding attempt. |
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The scarce Cetti's warbler breeds in the broads and breeding common cranes are found in the area. |
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In June 2014, an unknown number of baby squirrels have been pictured in the Abbey Gardens, proving the squirrels are successfully breeding. |
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The development, via plant breeding, of new varieties is a major occupation of floriculturists. |
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Bellowing choruses occur most often in the spring when breeding groups congregate, but can occur at any time of year. |
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Solitary animals defend a territory and avoid social interactions with the members of its species, except during breeding season. |
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Consequently timing of the first breeding as well as all the subsequent breeding is important for maintaining milk production levels. |
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Most commonly, dairy producers discuss the estrous cycle as beginning when the cow is receptive to breeding. |
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These seed stocks are available for legitimate breeding and research efforts. |
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These efforts have resulted in significant regionally adapted breeding lines and hybrids, such as the Mountain series from North Carolina. |
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The poor taste and lack of sugar in modern garden and commercial tomato varieties resulted from breeding tomatoes to ripen uniformly red. |
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The growth of organic farming has renewed research in alternative technologies such as integrated pest management and selective breeding. |
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Significant advances in plant breeding ensued after the work of geneticist Gregor Mendel. |
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Careful selection and breeding have had enormous effects on the characteristics of crop plants. |
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After this however, nonbreeding females on average have a higher fat mass than the breeding females. |
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Females with a normal body size who have had sufficient summer nutrition, can begin breeding anytime between the ages of one to three years. |
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It is generally believed that larger fish have a greater breeding potential. |
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I resolved to find all my pits good homes and to get out of the rescue and breeding business. |
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Selective breeding has been responsible for some large increases in productivity. |
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Important aspects of husbandry at these early stages include selection of breeding stock, control of water quality and nutrition. |
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The movement advocated selective breeding, compulsory sterilization, and a close alignment of public health with eugenics. |
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The Spaniards were also skilled at breeding dogs for war, hunting and protection. |
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He forbade the selling of women, theft, fighting among the Mongols, and the hunting of animals during the breeding season. |
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Bachelor males either live alone or with groups of other bachelors until they are old enough to challenge a breeding stallion. |
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The islands are also an important breeding area for seabirds including the Cape Verde shearwater. |
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While the nobles held the titles, those individuals of lesser breeding did the real work. |
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But confraternities also later pursued cattle ranching, as well as mule and horse breeding, depending on the local situation. |
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New Guinea has 578 species of breeding birds, of which 324 species are endemic. |
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The mangroves are the breeding grounds for black scallops, which are served up in Tumbes' most famous dish, the black scallop ceviche. |
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The island also hosts scientists who study pinnipeds and manage the island fox captive breeding program that is conducted on the island. |
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In 2002 and 2006 breeding pairs of bald eagles were reintroduced to the northern islands. |
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Svalbard is a breeding ground for many seabirds, and also supports polar bears, reindeer and marine mammals. |
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Arctic foxes form monogamous pairs during the breeding season and they stay together to raise their young in complex underground dens. |
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Arctic foxes tend to form monogamous pairs in the breeding season and maintain a territory around the den. |
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As a shallow tropical sea, its waters are a breeding ground for tropical cyclones. |
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The majority of the sea's islands are uninhabited making them ideal breeding grounds for seals, sea lions, seabirds, and other sea island fauna. |
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However, through selective breeding, some breeds of horses are quite docile, particularly certain draft horses. |
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The subspecies was presumed extinct in the wild between 1969 and 1992, while a small breeding population survived in zoos around the world. |
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Their rate of growth and mature weight is a heritable trait that is often selected for in breeding. |
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The purpose of these glands is uncertain, but those on the face may be used in breeding behaviors. |
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Following millennia of selective breeding, there are now over a thousand different types of potatoes. |
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Maize breeding in prehistory resulted in large plants producing large ears. |
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Modern breeding began with individuals who selected highly productive varieties in their fields and then sold seed to other farmers. |
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University supported breeding programs were especially important in developing and introducing modern hybrids. |
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Some have argued it would have taken too many generations of selective breeding to produce large, compressed ears for efficient cultivation. |
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Researchers at North Carolina State University are breeding sweet potato cultivars that would be grown primarily for biofuel production. |
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Cattle, sheep, pig rearing and some horse breeding are the main types of husbandry practiced. |
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Selection favoring recessives is common in maize breeding for several traits, such as sweetness, opacity, brachysm, lack of ligules. |
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The SSSI is made up of mostly coastal dunes and salt marsh attracting breeding birds and a profusion of flowers. |
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If there are no nesting sites available, young ospreys may be forced to delay breeding. |
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Linear breeding territories are established by pairs of dippers along suitable rivers, and maintained against incursion by other dippers. |
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The peregrine's breeding range includes land regions from the Arctic tundra to the tropics. |
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The main reason for taking wild peregrines at this point is to maintain healthy genetic diversity in the breeding lines. |
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Several peregrine subspecies were included in the breeding stock, including birds of Eurasian origin. |
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The association is an active organisation point for Swaledale sales, shows, breeding, and products. |
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Soon after acquiring Hill Top Farm, Potter became keenly interested in the breeding and raising of Herdwick sheep, the indigenous fell sheep. |
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At Besthorpe near Newark, breeding pairs of little egrets and grey herons have been observed. |
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The Ribble is also a key breeding ground for the endangered Atlantic salmon. |
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Interest in reintroducing the species was further bolstered in 2016 in relation to a successful breeding program for the Iberian lynx in Spain. |
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It is a sedentary species, breeding across northern Eurasia in moorland and bog areas near to woodland, mostly boreal. |
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The breeding habitat is marshes, bogs, tundra and wet meadows throughout northern Europe and northern Asia. |
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It is one of the most widespread of the curlews, breeding across temperate Europe and Asia. |
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There are a number of subspecies differing mainly in the extent of rufous colouration in the breeding plumage and the bill length. |
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The majority of brood care is provided by the male, as the female deserts the brood and often leaves the breeding area. |
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During breeding season, the males make great spectacles of themselves in flight to attract females. |
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Twites can form large flocks outside the breeding season, sometimes mixed with other finches on coasts and salt marshes. |
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Spermatophagy as used by bark beetle researchers denotes species breeding in seeds and the surrounding fruit tissues. |
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By breeding two troglobitic species of the genus Aphaenops, she was able to obtain the first larval instar and observed that it does not feed. |
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Notwithstanding his clothes, there was an air of breeding about him, unconcealable, a thing apart, even, from his good looks. |
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Multiple mating and cooperative breeding in polygynandrous Alpine Accentors. |
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Tammar wallabies that live on the well-lit landscape of Australia's largest naval base muddle the timing of their natural breeding season. |
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The tiny mammal, yet to be named, is the first Parma Wallaby to be born at the Pembrokeshire attraction as part of a European breeding programme. |
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After all its cattle were culled, Gwyn and Thelma focussed on livery grazing and built up a stud breeding warmbloods and coloureds. |
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The area is an important breeding ground for birds such as reed warblers, reed buntings and water rail. |
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A second family-run breeding business near Goodooga in western New South Wales provides weaner steers and heifers for finishing in the west. |
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Upon further discussion we felt we'd be foolish to pay for weaners every year and decided to jump in with both feet and purchase breeding stock. |
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Even in the most well-kept apartment houses, ventilation ductwork can become a breeding ground for mold, mildew, fungi and bacteria. |
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Graves has been breeding and training Pembroke Welsh corgi for seven years. |
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Whimbrels have left their breeding grounds in the Shetland Isles, Outer Hebrides and Iceland. |
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The white-tailed eagle is greenlisted here and the birds are rare across Europe with only 10,000 breeding pairs in existence. |
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Iran's cafe society has been targeted as a fertile breeding ground for dissidents. |
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To aim at breeding, raising, and fattening one cattle beast from every ten cultivated acres of the Province. |
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We must thank the memory of this brought to us now, when it is not muffled as usual by good breeding, courtesy and Christcentrism. |
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Ermine never let any one be condescending to her, and conducted the conversation with her usual graceful good breeding. |
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Some essence of dogitude shines through all the caprices of taste and breeding that humans have applied to the animal. |
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Tens of millions of birds make use of the North Sea for breeding, feeding, or migratory stopovers every year. |
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The island is noted for the breeding and training of race horses and is also a large exporter of racing dogs. |
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Celtic agriculture and animal breeding produced a wide variety of foodstuffs for Celts and Britons. |
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The most common breeding birds are the willow warbler, common chaffinch, and redwing. |
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Did these bones cost no more the breeding but to play at loggets with them? |
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He later called his theory natural selection, an analogy with what he termed the artificial selection of selective breeding. |
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His friend Rothwell, who had the use of the best Laveracks for breeding purposes, wrote him that one of his puppies was liver and white. |
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Did these bones cost no more the breeding, but to play at loggats with 'em? |
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Demand has increased for this massive breeding programme to be scaled back. |
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Other stallions of oriental breeding were less influential, but still made noteworthy contributions to the breed. |
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In all, about 160 stallions of Oriental breeding have been traced in the historical record as contributing to the creation of the Thoroughbred. |
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An aspect of the modern British breeding establishment is that they breed not only for flat racing, but also for steeplechasing. |
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Maryland and Virginia were the centers of Colonial Thoroughbred breeding, along with South Carolina and New York. |
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Diomed, who won the Derby Stakes in 1780, had a significant impact on American Thoroughbred breeding, mainly through his son Sir Archy. |
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After the American Revolution, the center of Thoroughbred breeding and racing in the United States moved west. |
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Lexington went on to a career as a breeding stallion, and led the sires list of number of winners for sixteen years, fourteen of them in a row. |
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World War I almost destroyed French breeding because of war damage and lack of races. |
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Other countries in Europe have Thoroughbred breeding programs, including Germany, Russia, Poland, and Hungary. |
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In addition, the track record of a race horse may influence its future value as a breeding animal. |
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Horses finished with a racing career that are not suitable for breeding purposes often become riding horses or other equine companions. |
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Poor breeding may be encouraged by the fact that many horses are sent to the breeding shed following an injury. |
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Today India has a very well established racing and breeding industry, and the sport is conducted on nine racetracks by seven racing authorities. |
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The horses are much cheaper, as the majority are geldings and have no breeding value. |
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The domestic animals of the Faroe Islands are a result of 1,200 years of isolated breeding. |
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Horse Racing has a very large presence in Ireland, with one of the most influential breeding and racing operations based in the country. |
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The programme includes captive breeding and release, public awareness and habitat restoration activities. |
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Poland is the most important breeding ground for a variety of European migratory birds. |
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However, these islands provide breeding grounds for many important seabird species including the world's largest colony of northern gannets. |
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The total bird list for the Chagos Archipelago, including Diego Garcia, consists of 91 species, with large breeding populations of 16 species. |
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Qatar was described as a famous horse and camel breeding centre during the Umayyad period. |
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These changes have a significant impact on the growing, breeding and migration seasons, as well as species abundance and diversity. |
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Bell also built the forerunner to the iron lung and experimented with breeding sheep. |
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Some countries and regions have a long tradition as major breeding centers, namely Ireland and Kentucky. |
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In the world's major Thoroughbred racing countries, breeding of racehorses is a huge industry providing over a million jobs worldwide. |
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In 2014 the Dutch Kennel Club implemented some breeding rules to improve the health of the Bulldog. |
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Kuwaiti islands are important breeding areas for four species of tern and the socotra cormorant. |
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The peninsula is the breeding ground for Steller's sea eagle, one of the largest eagle species, along with the golden eagle and gyr falcon. |
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A reduced blood flow in the webbing on their feet outside of the breeding season also helps to maintain body temperature when they swim. |
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For this reason there is a close relationship between the location of northern gannet breeding colonies and the distribution of these fish. |
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The northern limit of their breeding area depends on the presence of waters that are free of sea ice during the breeding season. |
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Some breeding colonies have been recorded as being located in the same place for hundreds of years. |
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The area which a nest occupies grows throughout the breeding season as the breeding pairs throw their excrement outside the nest. |
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The fights are preceded by threatening gestures, which are also seen outside the breeding season. |
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Should one of the pair die the other bird will leave the breeding ground and pair up with another single bird. |
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This is a frequent cause of death for chicks of birds that are breeding for the first time. |
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The young birds are attacked by adults if they enter the breeding ground, so they stay at sea learning to fish and fly. |
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The golden eagle ranks as the second heaviest breeding eagle in North America, Europe and Africa but the fourth heaviest in Asia. |
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While many accipitrids are not known for their strong voices, golden eagles have a particular tendency for silence, even while breeding. |
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The flat, relatively open landscapes in these regions hold relatively few resident breeding golden eagles. |
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In the dry Southwestern United States, golden eagles tend to move to higher elevations once the breeding season is complete. |
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Generally, breeding success seems to be greatest where prey is available in abundance. |
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The breeding male has greyish upper parts with white wings and under parts. |
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Because of this high breeding rate, the size of the population is affected very little by factors such as hunting. |
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During the breeding season, the ranges of females remain unchanged, while males either become roamers, strayers or transients. |
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It will form flocks outside the breeding season, often mixed with other crossbills. |
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The wildcat is a largely solitary animal, except during the breeding period. |
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However, outside the breeding season and particularly in winter, several red squirrels may share a drey to keep warm. |
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Northern birds move south in winter, mostly staying in the west of the breeding range, but also to eastern Turkey, northern Tunisia and Algeria. |
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In France, breeding populations have decreased in the northeast, but seem to be stable in southwest and central France and Corsica. |
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Between 1989 and 1993, 90 birds were released in the Chilterns Area of Outstanding Natural Beauty and by 2002, 139 pairs were breeding there. |
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The aforementioned factor makes interspecific breeding unlikely in areas where the two species' ranges overlap. |
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Unlike most other rodents, beaver pairs are monogamous, staying together for multiple breeding seasons. |
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While widespread signs of vagrant beavers were found, spread as a breeding animal was slowed by watershed divides in the hilly terrain. |
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The breeding period in most areas lasts from November to January, though most mating only lasts a month and a half. |
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It was not uncommon for medieval hunters to deliberately hunt boars during the breeding season, when the animals were more aggressive. |
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A review of other known breeding stations of this subspecies suggests that breeding sites are subject to periods of nontenancy. |
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In February, many migratory animals had not yet arrived back in Pembrokeshire for breeding. |
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This shearwater is mainly silent at sea, even when birds are gathered off the breeding colonies. |
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Since it visits its breeding colonies at night, a shearwater has adaptations for nocturnal vision too. |
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Records in the northeast Pacific are increasing, and breeding has been suspected in British Columbia and Alaska. |
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It is silent at sea, but at night the breeding colonies are alive with raucous cackling calls. |
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They shed the colourful outer parts of their bills after the breeding season, leaving a smaller and duller beak. |
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The colourful outer part of the bill is shed after the breeding season, revealing a smaller and duller true bill beneath. |
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Although the puffins are vocal at their breeding colonies, they are silent at sea. |
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After breeding, all three puffin species winter at sea, usually far from coasts and often extending south of the breeding range. |
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Kittiwakes are coastal breeding birds ranging in the North Pacific, North Atlantic, and Arctic oceans. |
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Presently, the major threat for the population is the destruction of breeding sites. |
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The razorbill has white underparts and a black head, neck, back and feet during breeding season. |
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A mating pair will court several times during breeding periods to strengthen their bond. |
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Other threatening interactions include oil pollution which can damage breeding sites. |
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Any damage to breeding sites can reduce possible nest sites and affect reproduction of the species. |
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When not breeding, several birds may also be loosely associated in good feeding areas, such as a fruiting tree, often with other thrushes. |
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These are more important outside the breeding season, when they can make up a considerable part of the merlin's diet. |
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The chicks fledge at around 36 days old, though breeding maturity is not reached until 2 years in females and 3 years in males. |
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Breeding females settle in discrete areas, whereas breeding males and dispersing juveniles have more fluid ranges, being more mobile. |
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This stage backfired, however, as the locals began breeding the goats in order to make more money. |
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Also, there is a report by Farley Mowat of historic breeding colonies as far south as Cape Hatteras, North Carolina. |
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Porpoises are sometimes kept in captivity and trained to perform tricks, but breeding success has been poor. |
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Japan has had three establishments designated for breeding them, and there have been five recorded births. |
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This breeding success proved that porpoises can be successfully bred in captivity, and this could open up new conservation options. |
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There have also been efforts to study porpoise biology to help specialize conservation through captivation breeding. |
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Commercial char breeding stocks have now been developed largely from these sources. |
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Animals are domesticated when their breeding and living conditions are controlled by humans. |
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Despite the aridity, the presence of many lagoons makes this region very marshy and a suitable breeding ground for malaria mosquitos. |
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The long history of breeding has resulted in thousands of different cultivars. |
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Over a century of breeding has resulted in thousands of varieties and cultivars being available from both general and specialist suppliers. |
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Daffodil breeding has introduced a wide range of colours, in both the outer perianth tepal segment and the inner corona. |
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The county's coastline includes internationally important seabird breeding sites and numerous bays and sandy beaches. |
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This bank, just south of the village of Kirkcolm, is an important breeding ground for terns. |
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At the mouth of the lough are several small rock and shingle islands which are breeding areas for terns that feed in its shallow waters. |
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This means that, by the time hatching occurs, it may be too late for the females to take part in that year's breeding cycle. |
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Biological factors include breeding, predation, concentration of phytoplankton, and vertical migration. |
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Males, on the other hand, visit the breeding areas every year, attempting to mate. |
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Their favored breeding beaches are mainland sites facing deep water, and they seem to avoid those sites protected by coral reefs. |
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Since green sea turtles migrate long distances during breeding seasons, they have special adaptive systems in order to navigate. |
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Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds. |
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Also, the longer days of the northern summer provide extended time for breeding birds to feed their young. |
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The European pied flycatcher Ficedula hypoleuca also follows this migratory trend, breeding in Asia and Europe and wintering in Africa. |
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Long distance migrants are believed to disperse as young birds and form attachments to potential breeding sites and to favourite wintering sites. |
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Studies have shown a variety of effects including timing changes in migration, breeding as well as population variations. |
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Many shorebirds display migratory patterns and often migrate before breeding season. |
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Due to the extended period of care, breeding occurs every two years rather than annually for some species. |
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This increases breeding success, provides a place for returning mates to reunite, and reduces the costs of prospecting for a new site. |
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Young adults breeding for the first time usually return to their natal colony, and often nest close to where they hatched. |
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Other species also migrate shorter distances away from the breeding sites, their distribution at sea determined by the availability of food. |
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Seabirds, breeding predominantly on small isolated islands, have lost many predator defence behaviours. |
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Many seabirds are little studied and poorly known, due to living far out to sea and breeding in isolated colonies. |
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The Mergini take on the eclipse plumage during the late summer, and molt into their breeding plumage during the winter. |
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Although the common scoter is a winter visitor to the UK, there are some breeding pairs in the north of Scotland. |
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The location of winter breeding areas is still unknown, since these whales tend to migrate in the open ocean. |
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Recent research on mitochondrial DNA reveals that groups living in proximity to each other may represent distinct breeding pools. |
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Outside breeding grounds, slow clicks are rarely heard, and usually near the surface. |
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Mating is thought to occur when different groups meet up, and breeding within units is a rare occurrence. |
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Sparring and more vicious fights generally result from territorial defence in the breeding season. |
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As such, orcas are among the animals that undergo menopause and live for decades after they have finished breeding. |
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As of March 2016, SeaWorld has announced that they will be ending their orca breeding program and their theatrical shows. |
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During the breeding season, it is common for females to have several mates. |
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It is also unknown whether any winter breeding grounds ever existed beyond Chinese coasts. |
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In their breeding grounds in Baja California, Mexican law protects whales in their lagoons while still permitting whale watching. |
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Researchers have found males gather underwater, turn on their backs, put their heads together and vocalize to attract females ready for breeding. |
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Harbor seals must spend a great deal of time on shore when moulting, which occurs shortly after breeding. |
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Few islands are favorable for breeding, and those that are tend to be crowded. |
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Svalbard is a breeding ground for many seabirds, and also features polar bears, reindeer, the Arctic fox, and certain marine mammals. |
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Svalbard and Franz Joseph Land share a common population of 3,000 polar bears, with Kong Karls Land being the most important breeding ground. |
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They feed on marine animals and spend most of their lifetime on water, many only going on land for breeding. |
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Fish farming can enclose the entire breeding cycle of the fish, with fish being bred in captivity. |
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The blanket bog further inland also provides a good habitat for breeding waders, such as Golden Plover, Dunlin and Snipe. |
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First, human settlement is often attracted to shorelines, and settlement often disrupts breeding habitats for littoral zone species. |
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Fish can be negatively affected by docks and retaining walls which remove breeding habitat in shallow water. |
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Microscopic organisms thrive and larger species enter a rapid breeding cycle. |
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It is also an important breeding area for common tern, and a feeding area for marsh harriers. |
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Some of them survive now in captive breeding programmes, but others are probably extinct. |
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Due to their naturally short lifespan and early breeding age pouting are seen as a relatively sustainable fish to eat. |
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Disease control focuses on containing infections and breeding resistant strains, and is the subject of much ongoing research. |
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Visitors can fish for estuarine species such as flounder for free but are advised not to disturb birds during the breeding season. |
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In excess of 170,000 birds inhabit Fowlsheugh at the peak breeding season between April and late July. |
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During breeding season the bluffs are dense in birds arriving, departing and feeding in the waters below. |
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This population level significantly decreased from the 1992 kittiwake count of 34,870 breeding pairs of this seabird. |
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They make grunting and chuckling sounds while eating and guttural calls during the breeding season. |
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The walking gait of gulls includes a slight side to side motion, something that can be exaggerated in breeding displays. |
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Other species move much shorter distances and may simply disperse along the coasts near their breeding sites. |
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Most gulls breed once a year and have predictable breeding seasons lasting for three to five months. |
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After breeding, terns moult into a winter plumage, typically showing a white forehead. |
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Terns have a worldwide distribution, breeding on all continents including Antarctica. |
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Most tern species are declining in numbers due to the loss or disturbance of breeding habitat, pollution and increased predation. |
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This sound may attract females, or may be used by the males to proclaim their territory or their readiness for breeding. |
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The harp seal population is found in three separate populations, each of which uses a specific breeding site. |
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This population is further divided into two separate herds based on the breeding location. |
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It is known that the hooded seal is generally a solitary species, except during breeding and moulting seasons. |
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From April through June, after the breeding season, this species travels long distances to feed and then eventually gather together once again. |
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During the spring breeding season, females construct lairs within the thick ice and give birth in these structures. |
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Before breeding, flamingo colonies split into breeding groups of about 15 to 50 birds. |
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They are gregarious birds, travelling in flocks, hunting cooperatively and breeding colonially. |
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However, several colonies are increasing in size and the colony at the Small Prespa Lake in Greece has nearly 1000 breeding pairs. |
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Overall population numbers fluctuate widely and erratically depending on wetland conditions and breeding success across the continent. |
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Captive breeding is meant to save species from extinction and so stabilize the population of the species that it will not disappear. |
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Additionally, if the captive breeding population is too small, then inbreeding may occur due to a reduced gene pool and reduce immunity. |
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The conservation expert Peter Paul van Dijk noted that turtle farmers often believe that animals caught wild are superior breeding stock. |
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Migrating fish may also be unable to access breeding streams, and may attempt to pass through the turbines. |
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Selective breeding of Rattus norvegicus has produced the laboratory rat, a model organism in biological research, as well as pet rats. |
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As it is commonly heard during the breeding season, it is thought to be emitted by vixens summoning males. |
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