Actual Size by Steve Jenkins
It's interesting enough to read that a giant squid's eye can be 12 inches in diameter. We don't realize the full implication of that fact until we're looking at it and realize that said eye is larger than our heads. And that's what gives this book such broad appeal. Little ones will enjoy comparing the size of their heads, hands, and more to the animals in this book. for older readers each page has a few animal facts. Jenkins has also written a similar book for dinosaur fans: Prehistoric Actual Size. I've used both of these books with my preschool storytime and they are always a hit, even drawing older siblings who usually ignore what we are doing into the conversation.