With all the attention given to the Terrible Lizards throughout their history, it's often easy to forget they weren't the only beasts terrorizing the world during the Mesozoic. In fact, the majority of reptiles of that era weren't dinosaurs at all, though they fell under the Archosaur lineage: Pterosaurs ruled the skies, whilst a variety of marine reptiles and crocodilians ruled the waters. This domination of other habitats by non-dinosaurs helps answer a nagging question about our favorite toothy monsters: with the exception of the avian-line dinos, why were dinosaurs limited only to the land? It's essential to lay down ground rules at this point, otherwise everything will become confused. First, as many a second-grader can (and will) tell you, pterosaurs and ichthyosaurs, reptiles of air and water respectively, were not dinosaurs. In fact, dinosaurs are pretty much defined by a land-based lifestyle and body plan, including hollow bones and an erect posture. Only one...
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