David Attenborough investigates two shells that have proved to be winners in evolution: the tortoise's shell and the shells of birds' eggs. The ostrich egg is so strong it is possible for a person to stand on it without it breaking, but how does the chick break out of this fortress? The evolution of the tortoise shell was for a long time a mystery and this bony box offers a lot more than just protection.
In the second of this two-part series, Colin Stafford-Johnson continues his journey in Cuba, one of the most captivating islands in the world. Here, he encounters bats emerging from a labyrinth of limestone caves to feed on nectar from giant hibiscus flowers, and tiny frogs, smaller than a fingernail, living in patches of hidden emerald forest. And on the white sand beaches, baby green turtles emerge from their nests to make their way to the sparkling Caribbean Sea.
David Attenborough reveals the life of the hippopotamus as never seen before. With incredible underwater footage, this film delves into the world of the hippo – an animal that cannot swim yet is utterly dependent on water. In Botswana's Okavango delta, hippos face an unparalleled challenge - deep floodwaters dry to dust in a matter of months. In one extraordinary season, the team go beneath the surface to see them protect their families and face their enemies as they deal with the drought. Going far beyond their dangerous reputation, the show discovers the true nature of the hippo, an animal that is compassionate, sensitive and highly intelligent.
Horizon discovers what your cat really gets up to when it leaves the cat flap. In a groundbreaking experiment, 50 cats from a village in Surrey are tagged with GPS collars and their every movement is recorded, day and night, as they hunt in our backyards and patrol the garden fences and hedgerows. Cats are fitted with specially developed cat-cams which reveal their unique view of our world. You may think you understand your pet, but their secret life is more surprising than we thought.