Deer are a fecund species, and they produce multiple offspring when stressed. |
The female needs a male to fertilize her egg, even though it is she who carries offspring through pregnancy and childbirth. |
Mongolian gerbil fathers' initial offspring avoidance has been a mystery, in that by day three they're dutiful dads. |
Of the 339 eggs transferred by the research team, 90 managed to implant properly in the uterus, and 15 offspring were born. |
Territorial sires fathered a greater proportion of the offspring of territorial dams than floater sires. |
The peahen chooses to mate with the male that will most likely produce strong, healthy offspring. |