Did you know that once upon a time, about 8 million years ago, guinea pigs weren' t sweet, cute, or little? We all know about the enormous dinosaurs that used to roam the earth, but millions of years ago, there were GREAT BIG GUINEA PIGS, too! During a bedtime story, one little guinea pig learns all about his very big ancestors, and how guinea pigs evolved into the lovable pets we have today. This fun and factual picture book by Susan Roth features richly textured cut-paper illustrations that bring to life the story of the great, big, prehistoric guinea pig.