Goes inside the largest animals on the planet to explore their anatomy, reveal their intricate inner workings and uncover their evolutionary secrets. In this episode, veterinary scientist Mark Evans and comparative anatomist Joy Reidenberg dissect a lion and tiger. On the outside, the animals look very different; but once their skins are removed, even the experts find it hard to distinguish the two.

Wildlife footage provides an intimate and playful look at the first year of adorable baby animals raised in ice and snow. Animals include emperor penguins, snow monkeys, polar bears, arctic foxes, and reindeer.

Tells stories of the most unlikely cross-species relationships imaginable: a chimp bottle-feeding a tiger cub, a giant tortoise snuggling with a baby hippo, a black crow parenting a meerkat. Looks at these remarkable relationships first hand, and through caregivers, biologists, and animal behaviorists. Explores what these cross-species relationships suggest about the nature of animal emotions.

From the shelter of our homes, snow looks magical, but it's a harsh reality to many animals. Snow means freezing temperatures, which these animals must endure for many months. Wildlife cameraman Gordon Buchanan meets some of the world's most iconic snow animals across the globe, from the penguins of Antarctica to the bison of Yellowstone and the Arctic fox. Takes a look at the world's most iconic snow animals across the globe.

Among the biggest land mammals on the planet, bears need a lot of resources to survive and must use all of their skills, brawn, and brains to get what they need, whether they're foraging for honeycombs or tasty plants, standing up to their rivals, or raising cubs. Follow the adventures of bears across the globe as they draw on their remarkable adaptations to survive in an ever-changing world. Find out what it really takes to be a bear.

Four years in the making, and filmed over 3000 days across every continent and in every habitat, see 130 incredible stories from frontiers of the natural world. Discover the glorious variety of life on Earth and the spectacular and extraordinary tactics animals and plants have developed to stay alive. This is evolution in action: individual creatures under extreme pressure to overcome challenges from adversaries and their environment.

The hippopotamus has long been an enigma: an aquatic mammal that cannot swim, a vegetarian that is also the most dangerous animal in Africa. All hippos are utterly dependent on water,but in Botswana, hippos face an unparalleled challenge as deep floodwaters dry to dust in a matter of months. The documentary goes beneath the surface to show how hippos protect their families and face their enemies, revealing an animal that is highly sensitive and surprisingly...

The Kratt Brothers are ready to take kids on an incredible adventure, as they come face to face with some of the most wild and exciting predators in the animal kingdom! Join Martin and Chris Kratt as they learn the ways of the cheetah, a wolf pack, birds of prey, and even uncover the mysteries of the great white shark! All while thwarting evildoers before it's too late!

This documentary looks at the plight of chimpanzees that have been used in research (specifically in space travel and medical testing). Goes into the problems various shelters have had with creating and maintaining sanctuaries for these chimpanzees, including the perceived risk to the public of having HIV chimpanzees in the neighborhood as well as trying to get a handle on the personalities and history of the chimpanzees themselves.

Otters are playful, adaptable and champion swimmers - they have captivated cameraman Charlie Hamilton James for the last 25 years. He has filmed them more than anyone else. Now, through the eyes of three orphaned river otters, a set of groundbreaking experiments and some incredible wild encounters, Charlie wants to reveal their survival secrets and exactly why he believes they are so special.