And I'm not a singer

This book is about the evolution of sharks

The Silurian shark era, doo doo doo doo doo doo

Was the first shark, doo doo doo doo doo doo

was around 450 million years ago, doo doo doo doo doo doo

Silurian shark era!!!

Early Devonian shark era, doo doo doo doo doo doo

was the first fully developed shark, doo doo doo doo doo doo

had a lot of teeth, doo doo doo doo doo doo

oh, i'm scared of sharks.

late devonian shark era, doo doo doo doo doo doo

had very short teeth, doo doo doo doo doo doo

was eel-like, doo doo doo doo doo doo

kind of looks a little scary.

cretaceous shark period, doo doo doo doo doo doo

had ugly sharks, doo doo doo doo doo doo

called the goblin shark, doo doo doo doo doo doo

now this one is scary.