There may be nearly 40 different species of wild cat running around, but only a few make it into the big cat club, including the lion, tiger, leopard, and jaguar. They're armed with an arsenal of weapons and bulk to back up one hell of an attitude. In their world, nothing is small and many things are surprising. So get ready for a vicious lesson on what makes a big cat a big cat. Is it the roar? The teeth? We'll take a look at their size, speed, claws and hunting capabilities, among so much more.