As in "Dinosaurs"? Only a single one has been found as of 2012, an Edmontosaurus. As for more recent extinct creatures, lots of things. Mammoths, Mastodons, and many other creatures.
in prehistoric times, ichthyosaurs lived in Nevada.
Jellyfish
sharks
dinosaurs
sharks
bear dog
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Some of the most notable prehistoric animals that lived in Canada were the Dinosaurs. Other creatures included Sloths and Mammoths.
In prehistoric times Florida was underwater in the Siluarian Sea so you would find many sea creatures back then.
There are two named Angiereyas and tiffopians.
rats,mouses,birds,and racoons
Prehistoric sloths known as giant sloths lived in North America.