When left in the right environment, animals can become fossilized over thousands and millions of years… Almost everything we know about the prehistoric world has been learned from the discovery of fossils, and they’ve proven to be an incredible window into the past. While something can be learned from all of them, there are undoubtedly some that are more important and fascinating than the rest… so join us for today's video as we take a look at 15 incredible animal fossils.