Los secretos del reino animal

Grizzly gators perform an amazing, hissing water dance to tuba music. Remote cameras reveal the secrets of squirrel nut-stashing. Experts explain how a bug the size of a grain of salt can survive the vacuum of space.

A game of underwater copycat shows how dolphins are some of the animal kingdom's smartest creatures. The secrets behind a gecko's incredible and unique feet are revealed, and experts explain how leeches suck blood.

Experts explain how the blue whale become the biggest animal ever and why elephants have trunks. The reasons for ladybugs' spots and cats' purring are revealed.

Experts explain how cats detect earthquakes and owls hunt in total darkness. In South Africa, the secrets of cheetahs are revealed. Experts also show how sea otters keep warm in icy waters and how ants heal their wounded.

Experts explain the secrets behind a crocodile's powerful jaws, what a dog's tail wag means and how and why chameleons change color.

Incredible high speed footage reveals how the tiny but gorgeous hummingbird can do something no other bird can -- fly backwards. Experts explain the incredible durability of cockroaches and how dogs know to comfort their owners.

A bird expert reveals how a beautiful barn owl catches prey it can't even see. In Africa, a pack of wild dogs show the tactical and communication skills that have earned them the title as Africa's most successful hunters.

The secrets of animals revealed, from lizards walking on water to immortal jellyfish. Experts explain animal behavior, from how hippos can move faster through water than an Olympic swimmer to why cats have whiskers.