When we think of mammals, we usually think of animals that give birth to live babies, like lions or humans. But there’s a ...

A huge variety of animals produce eggs. These help to protect and provide for offspring as they develop. There are over 500 species of shark living in waters around the world and the majority give ...

This story appears in the September 2010 issue of National Geographic magazine. We fool ourselves most days. We imagine the Earth to be ours, but it belongs to them. We have barely begun to count ...