why small dinosaurs wouldn't have had the same likelihood of survival as small mammals? A good question. Of course one category of small theropod dinosaurs (cl

why small dinosaurs wouldn't have had the same likelihood of survival as small mammals? A good question. Of course one category of small theropod dinosaurs (clade Aves, commonly known as birds) did survive the extinction of the rest of the dinosaurs, as the article points out. It's a greater puzzler to figure out why the sea-going groups of clade Reptilia (NOT dinosaurs), like the mososaurs and plesiosaurs, became extinct. An extinction event that brings an end to life forms both on land and at sea is quite a major extinction event. http://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event http://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_ex...