A crocodile is a very patient hunter, and the polar bear can sniff out prey from long distance. But neither the crocodile nor the polar bear comes in at number one in the countdown. Find out who does, and how human hunters compare with the most extreme predators in the animal world.
Profiles the ten most extreme mothers in the animal kingdom based on their exceptional or unusual talents such as carrying their children in their mouths or being pregnant for almost two years.