I really liked this book--I enjoyed the story, I loved the way the pictures captured this prehistoric world. The rhyming text was smooth, fluid, creative, and fun to read aloud, and in a way, it sort of reminded me of the rhythm of A Frog in the Bog. My nephew enjoyed the dinosaurs in this book, and he enjoyed watching Tadpole Rex develop, but there were some things that he couldn't quite wrap his head around. E.g., "For somewhere inside him, deep in his core, there slumbered an inner tyrannosaur. A Rex who was fearless, with fire in his blood--" At this my nephew said, "Amy, I didn't know that tadpoles had fire inside their blood!" That was a somewhat challenging phrase to explain to a four year old. :-)