Board Thread:Movie Discussions/@comment-3367060-20131210214456/@comment-5025237-20140213182533

Look, considering the amount of reptiles that became water creatures once again during the Mesozoic, it's not too much of a stretch to suggest that some dinosaurs might have done so too, but their major advantage and the source of their success (legs directly under the body, allowing for easier and more agile locomotion) wouldn't apply in those circumstances, making an aquatic dinosaur growing to even moderate sizes questionable. More importantly, a Tyrannosaur-eque head makes a lot less sense for a water creature than a leaner Spinosaur/Baryonix-like head for catching fish. Then again, water pools were so rare during some periods of the Mesozoic (namely the earlier) that it makes a lot of sense to stay hidden in a pool whilst waiting for a creature to ambush, but being small or thin would be the advantage there, as it's extremely hard to hide yourself in shallow water.