Winter's Fortress • 2021 • episode "S1E2" • The Alps

48:05

A polar bear mother keeps watch over her cub as they wait for the coming winter and the plentiful feeding opportunities it brings. But there are threats abound: from cannibalistic male bears, to the devastating impact of climate change, which has delayed the seasonal freeze and put them at risk of starvation.

S1E8 • Arctic Secrets • 2015 • Nature

59:02

The first three critical months are when our animal babies have to rapidly get to grips with their new family and the challenges of environment that surrounds them.

S1E1 • Animal Babies: First Year on Earth • 2019 • 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.

S1E2 • Animals Behaving Badly • 2018 • Nature

50:03

The final programme looks at the superorganisms formed by bees, ants and termites. Attenborough reveals that their colonies, whose individuals were once considered purely servile, are "full of conflict, power struggles and mutinies." They evolved when such creatures moved away from a solitary existence and started building nests side-by-side, which led to a collective approach to caring for their young.

Part 5 • Life in the Undergrowth • 2005 • Nature

53:45

The next programme explores the various sea-living invertebrates. In Morocco, the limestones are 600 million years old, and contain many invertebrate fossils. They fall broadly into three categories: shells, crinoids and segmented shells. The evolution of shelled creatures is demonstrated with the flatworm, which eventually changed its body shape when burrowing became a necessity for either food or safety. It then evolved shielded tentacles and the casings eventually enveloped the entire body: these creatures are the brachiopods. The most successful shelled animals are the molluscs, of which there are some 80,000 different species.

2/13 • Life on Earth • 1979 • Nature

55:43

A group of world-renowned scientists are on a quest to uncover the secrets of the most significant day in our planet's history: the day that killed the dinosaurs. 66 million years ago an asteroid the size of London hit the planet in the modern-day Gulf of Mexico. Now, as co-leaders of an expedition to drill deep into the Chicxulub asteroid impact crater, Geologists Sean Gulick and Jo Morgan have set out to answer how this resulted in the extinction of dinosaurs.

S1E5 • Catalyst: Series 18 • 2017 • Nature