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Although great size, as well as a great range of body sizes, are among the most familiar qualities of dinosaurs, the early theropods were both small and fairly uniform.
However, these feathered theropods are clearly just one small group of dinosaurs, and if they were all transported to modern times, they are so similar we would put them all in the same small group.
Russell reminds readers that we do not know the biogeographic origin of birds, or theropods , or dinosaurs.
Accumulating evidence suggests that living birds are the direct descendants of theropods , a group of meat-eating dinosaurs that walked on two legs.
Much has been written about the small, late Cretaceous theropods known as alvarezsaurids.
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