What prehistoric creatures lived in Oklahoma?

Answer 1

About 10,000 years ago, animals like Columbian mammoths, mastodons, bison, giant ground sloths, huge armadillos called glyptodons, giant beavers, American lions, American cheetahs (although they aren't true cheetahs), Smilodon (the most famous kind of saber toothed cat), and even Dire wolves and flat faced bears, as well as modern animals, lived in Oklahoma.

During the late Cretaceous, about 90 to 70 million years ago, much of Oklahoma was submerged under the warm and shallow Western Interior Seaway. Here, animals like Ginsu sharks, plesiosaurs, mosasaurs (huge, carnivorous, marine lizards), huge turtles called Archelon, and even Hesperornis (a fully aquatic bird), lived there. The waters were also fished by birds called Icthyornis, and the largest pterosaur known, Quetzalcoatlus.

Note that some of these organisms are speculative; the reason being that they were found in very nearby areas with exactly the same habitat at the same time.