ZT2 has several expansions. They did do an Extinct Animals expansion and this would have included dinosaurs.
"More than 30 Extinct animals are ready to be brought back to life—just for your zoo! From the adorable dodo bird to the massive American mastodon, the ferocious saber-toothed cat, and the terrific T. rex"
I do not know what other expansions you would need as well.
There is also a complete collection which would include that.