If you get most of your information about ancient animals from vintage cartoons or action figures, then a lot of things that you think of as "dinosaurs" actually weren't. Learn about the definition of true dinosaurs and the evolutionary relationships shared by the non-dino reptiles that lived on land, in the sea, and in the air.

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Sources:
http://pubs.usgs.gov/gip/dinosaurs/al...
http://www.ucmp.berkeley.edu/diapsids...
http://plesiosauria.com/evolution.php
http://www.ucmp.berkeley.edu/diapsids...
http://www.wisegeek.com/what-are-mosa...
http://history.nd.gov/activities/Mosa...
http://www.ucmp.berkeley.edu/taxa/ver...
https://archosaurmusings.wordpress.co...
http://www.sciencedaily.com/releases/...
http://biology.fullerton.edu/biol325/...

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