Nice animation
However, there was too much happening at the same time. While reading all your texts, a lot of animation was going on that I really didn't have to watch, just because of the texts.
Also, the step between fish and land living reptiles (they still exist on some locations) were some fish like creatures who had frontal fins that looked a lot more like paws, and they both breathed air and gills (traces of this still left behind in humans for example, and is called hiccups (a reflex that caused the switch between using gills and lungs))
I liked your drawing style however. Good job!