| The radiation of birds from the theropod stem may be an example of this sort of thing. |
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| New theropod integumental structures have been repeatedly dismissed as connective tissues, such as frayed collagen fibers or ossified tendons. |
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| His work provided strong, compelling support for the theory that birds are theropod dinosaurs. |
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| They do still have two skeletons of Tarbosaurus, a theropod dinosaur related to Tyrannosaurus rex. |
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| These great birds were the last successors of the mighty theropod dinosaurs of the Mesozoic. |
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| Birds arose from theropod dinosaurs at some point in the Jurassic, according to present knowledge. |
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| This clear-cut distinction was upset in the 1960s and 70s by the discovery of unusual medium-sized theropod dinosaurs such as Deinonychus. |
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| The evidence of nesting and parental care in ornithischian, sauropod, and theropod dinosaurs is extensive. |
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| The pectoral girdle and forelimb also reveal suites of hierarchically nested morphological novelties supporting the theropod origin of birds. |
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| Dromaeosaurs, a group of small, fleet-footed dinosaurs in the theropod family, are thought to be the closest known relatives of birds. |
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| Decades later he discovered a new species of theropod and named it Gojirasaurus. |
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| Sifting through the collection, they separated out the bones of a theropod, or meat-eating dinosaur. |
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| In the Mesozoic top predators included the biggest theropod dinosaurs on land, and pliosaurs and mosasaurs in the seas. |
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| He has not only rewritten the book on theropod myology, but has spent a good many years applying it to locomotion studies. |
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| Birds, close cousins of pterodactyls, are believed to have evolved from theropod dinosaurs about 150 million years ago. |
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| Ornithomimosaurs were a group of toothless meat-eating theropod dinosaurs that lived in the Cretaceous period. |
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| Because feathers are a unique feature, they are thought to be characteristic of many theropod dinosaurs, including tyrannosaurs. |
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| We know that it is a dromaeosaur, a theropod and relative of Velociraptor. |
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| Ornithoid eggshells are equally abundant and occur in association with relatively uncommon sauropod eggshell fragments and denticulated theropod teeth. |
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| Distinctive eggshell microstructure indicates that birds nested here and, surprisingly, so did theropod dinosaurs. |
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| However, microscopic studies of the eggshells have shown that they were not ceratopsian but theropod. |
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| In that sort of environment even a big theropod would constantly have been looking over its shoulder. |
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| Later, some bipedal theropod dinosaurs became the first birds, about 150 million years ago. |
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| As much as we like to imagine sauropods stamping their feet and lashing their tails to drive off the vicious theropod predators, the scenario is unlikely for a simple reason. |
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| Critics of the theropod hypotheses usually advocate a thecodont origin of birds, an aerodynamic origin of feathers, and an arboreal origin of flight. |
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| If no later birds had evolved, Archaeopteryx would be classified as a feathered theropod, assuming we understood feathers in the absence of birds. |
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| Ornithomimids were a distinctive group of theropod dinosaurs who show a good example of convergent evolution with the ratite birds, such as ostriches. |
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| Cannibalism amongst some species of dinosaurs was confirmed by tooth marks found in Madagascar in 2003, involving the theropod Majungasaurus. |
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| In many hadrosaur and theropod dinosaurs, the caudal vertebrae were reinforced by ossified tendons. |
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| Allosaurs, sometimes confused with the Tyrannosaurus rex, were large theropod dinosaurs. |
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| Chilesaurus is the first herbivorous theropod, a lineage that includes mainly predatory dinosaurs, from the southern hemisphere. |
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| It now seems clear that several theropod dinosaurs including Carcharodontosaurus, another of Stromer's discoveries lost in Munich were far larger than T. rex. |
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| Interestingly, the holotype specimen of Talos also tells us something about theropod behavior, particularly raptor behavior. |
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| The first birds also appeared during the Jurassic, having evolved from a branch of theropod dinosaurs. |
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| The fossil record indicates that birds are modern feathered dinosaurs, having evolved from theropod ancestors during the Jurassic Period. |
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| Birds are now recognized as being the sole surviving lineage of theropod dinosaurs. |
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| They showed that the branch of theropod dinosaurs, which gave rise to modern birds, were the only dinosaurs that kept getting inexorably smaller. |
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| Instead of theropod footmarks, they found those of crocodilians. |
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| Other theropod dinosaurs, like the tyrannosaurs, were also bipedal. |
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| Some researchers call it an early theropod, but others say it falls even deeper back in the family tree, somewhere just outside being either a theropod or a sauropodomorph. |
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| Using tools normally employed to study the evolution of viruses, the team looked at 1,500 body traits across 120 species of theropod and early birds. |
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| Scientists believe that birds evolved from theropod dinosaurs. |
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| Birds share over a hundred distinct anatomical features with theropod dinosaurs, which are now generally accepted to have been their closest ancient relatives. |
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| Theropod dinosaurs are seen to exhibit too many terrestrial and cursorial adaptations to be avian precursors. |
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