|Hell Creek Chondrichthyans|
|(c) Duane Nash|
T-rex was the ubiquitous large theropod of its habitat. It lived fast and died young. Work by Jack Horner suggests it formed up to 20% of the dinosaur fauna where it lived. The withdrawal of the Western Interior Seaway would have left a huge swampy habitat, no reason to believe T-rex would not have exploited the aquatic fauna of crocs, turtles, fish, champosaurs and chondrichthyans in this area.
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