Descent into the Mariana Trench • 2018 • episode "Part 3" • Deep Ocean

54:17

The episode begins in the South American rainforest whose rich variety of life forms is used to illustrate the sheer number of different species. Since many are dependent on others for food or means of reproduction, David Attenborough argues that they couldn't all have appeared at once. He sets out to discover which came first, and the reasons for such diversity. He starts by explaining the theories of Charles Darwin and the process of natural selection, using the giant tortoises of the Galapagos Islands (where Darwin voyaged on HMS Beagle) as an example. Fossils provide evidence of the earliest life, and Attenborough travels a vertical mile into the Grand Canyon in search of them.

1/13 • Life on Earth • 1979 • Nature

22:19

Here we discover that some animals are able to trick others into believing they are something that they are not. The art of deception is a powerful attribute for some.

S2E4 • Natural Curiosities • Nature

57:44

Liz meets the animal rogues doing whatever it takes to find food. From kleptomaniac crabs on a stealing spree, tigers deceiving their prey and chimpanzees waging war on their neighbours, the need for a square meal can drive many animals to some seemingly extreme behaviour. Liz sets out to discover the science behind these tactics, joining experts making new discoveries around the world. She sees macaques using psychology to pull off a theft, a spider conning its prey with a chemical disguise and the wedge-billed hummingbird stealing nectar from under the beaks of its rivals. When it comes to finding food, this outrageous behaviour is actually an ingenious way to get ahead.

2/3 • Animals Behaving Badly • 2018 • Nature

28:03

The team has come to the very deepest part of the jungle, where streams contain the richest life, as well as danger, from four-metre caiman and the electric eel - a fish with a 600 volt shock.

S1E4 • Amazon Abyss • 2005 • Nature

52:55

This episode continues the study of mammals, and particularly those whose young gestate inside their bodies. Attenborough asks why these have become so varied and tries to discover the common theme that links them. Examples of primitive mammals that are still alive today include the treeshrew, the desman and the star-nosed mole. Insect eaters vary enormously from the aardvark, giant anteater and pangolin to those to which much of this programme is devoted: the bats, of which there are nearly 1,000 different species. These took to flying at night, and its possible that they evolved from treeshrews that jumped from tree to tree, in much the same way as a flying squirrel.

10/13 • Life on Earth • 1979 • Nature

51:40

The Pleistocene Era, when packs of saber-tooths ruled. The arrival of the new cats; early snow leopards, cheetahs, and jaguars, marked a turning point in the evolutionary track. Their emergence as their innovative hunting techniques and physical advantages enable them to dominate their habitats.

1/3 • Age of Big Cats • 2018 • Nature