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Many animals that live in water come on land to have their babies. Being born this way presents some major challenges for water babies to overcome. For some, simply getting to water in the first place can be the biggest trial of their young lives.

Mountains are some of the most challenging places for animals to live. Mountain babies must battle extreme weather and hungry predators. With food difficult to find, they have to work hard for every mouthful.

Exploring the extraordinary sense of sight in the animal world; Helen Czerski and Patrick Aryee reveal how caribou use ultraviolet light to avoid wolves.

Helen Czerski and Patrick Aryee reveal how alligators use low pitch rumbles to make the water around them dance; they give a herd of elephants a hearing test.

Exploring the world of scent, including animals that have pushed their sense of smell way beyond human abilities; diving into shark-infested waters in the Bahamas.

At a home for rescued baby chimps in Liberia, Jim and Jenny Desmond teach the orphans the skills they would have learned from their mothers in the wild; a new orphan named Miracle is rescued from her life on a chain.

At Liberia's only home for rescued chimpanzees, there are more new arrivals; Jimmy and Jenny Desmond and their team now have 28 chimps to look after, including an 8-week-old baby called Gaia.

Jimmy and Jenny Desmond and their team are at breaking point, with 38 chimps to look after; losing one of them to illness leaves the team more determined than ever to build them all a new sanctuary where they can live like wild chimps.

Animals appear to have stretched their natural gifts to the limits, including giraffes and chameleons.

Curiosities lead to accusations of forgery.

Sir David Attenborough looks at some amazing quirks of evolution; he encounters two examples where nature has tinkered with the aging process.

David Attenborough looks at the tusk of the narwhal and the spiral shells found on snails and ammonites.

Beautifully patterned or brightly colored animals attract the attention of collectors.

Female Komodo dragons can reproduce without contact with a male; female aphids can clone themselves to produce copies.

Rhinos and hedgehogs protect themselves with body armor in the form of thick skin.

Animals adapt to life in the dark; owl eyes are too large to move within their sockets; the giant squid has the largest eyes in the animal kingdom.

Sir David Attenborough shines the spotlight on amazing animals; he looks at cuckoos and the way the death's-head hawkmoth steals honey.

Sir David Attenborough shines the spotlight on nature's most amazing animals; he takes a closer look at the vampire bat.

How naturalists find out that some eels are electric is revealed.

Sir David Attenborough shines the spotlight on the wood frog, which freezes solid; he looks at how the emperor penguin breeds.

Nature produces two unique mechanisms of natural construction; weaving in birds and silk fascinate scientists.

David Attenborough shines the spotlight on female hyenas; he examines why male seahorses give birth.

Examining how swallows appear each spring; Insects, such as butterflies, suddenly arrive in the summer.

David Attenborough examines how fleas jump; he tracks the true speed of a cheetah.

David Attenborough examines orangutans and crows, two unusual animals that use tools.

David Attenborough examines creatures that have fascinated people for centuries; he looks at the expandable bodies of anacondas and camels.

A look at some species with unusual styles of consuming food, including the gigantic blue whales and the flamboyant flamingos.

David Attenborough examines some species with remarkable healing properties.

A look at the incredible animals who can regenerate entire parts of their bodies, like salamanders and deer.

Sir David Attenborough examines bizarre and deadly hybrid animals.

Sir David Attenborough examines animals with the ability to find their way.

Sir David Attenborough examines the sizes of animals' young.

Sir David Attenborough discovers if animals and plants can count.

Sir David Attenborough investigates two shells that win at evolution.

Sir David Attenborough explores animals with fighting behavior.

Animals appear to have stretched their natural gifts to the limits, including giraffes and chameleons.

Curiosities lead to accusations of forgery.

Sir David Attenborough looks at some amazing quirks of evolution; he encounters two examples where nature has tinkered with the aging process.

David Attenborough looks at the tusk of the narwhal and the spiral shells found on snails and ammonites.

Beautifully patterned or brightly colored animals attract the attention of collectors.

Female Komodo dragons can reproduce without contact with a male; female aphids can clone themselves to produce copies.

Rhinos and hedgehogs protect themselves with body armor in the form of thick skin.

Animals adapt to life in the dark; owl eyes are too large to move within their sockets; the giant squid has the largest eyes in the animal kingdom.

Sir David Attenborough shines the spotlight on amazing animals; he looks at cuckoos and the way the death's-head hawkmoth steals honey.

Sir David Attenborough shines the spotlight on nature's most amazing animals; he takes a closer look at the vampire bat.

How naturalists find out that some eels are electric is revealed.

Sir David Attenborough shines the spotlight on the wood frog, which freezes solid; he looks at how the emperor penguin breeds.

Nature produces two unique mechanisms of natural construction; weaving in birds and silk fascinate scientists.

David Attenborough shines the spotlight on female hyenas; he examines why male seahorses give birth.

Examining how swallows appear each spring; Insects, such as butterflies, suddenly arrive in the summer.