Did you know that tree squirrels can be found all over the world except in Australia and Antarctica? In North America, there are nine main kinds of tree squirrels. And they always seem to be on the move. Whether they are scampering along branches or leaping from tree to tree, they never seem to stay still. So if you want to finds out more about these busy rodents, you'll have to run!

About the series: Each book in the Welcome to the World of Series introduces children to wildlife through color photographs, lively description and amazing facts.