By Kathi Appelt, Alison McGhee

By Sara Pennypacker

While we humans need every organ of our body, animals seem to adapt and even thrive when they are missing body parts that we consider crucial to survive - There is the Borneo fr...

Most animals that hibernate during cold winter months have thick coats of fur or layers of fat to protect them. However, the Rana sylvatica species of the wood frog that can be ...