A Leopard's Last Stand • 2015 • episode "S1E2" • Africa's Hunters

59:22

Liz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science, or ultimately be consigned to history. Should zoos cull their animals to manage populations? Liz travels to Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer. But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them for stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.

Horizon • 2016 • Nature

58:10

The long-awaited arrival of the great migration brings opportunities and food in abundance, but it also increases conflict as every one of the Serengeti's families is put to the test. Tragedy strikes for lioness Kali, who is forced to make one of the most difficult decisions of her life. Can she return to the pride that once forced her out? Whatever she decides, it will put her cubs in danger. Shani, the zebra mother, has no choice but to cross the river, but the crocodile is waiting and the currents are treacherous. Will her foal survive? Bakari is finally forced to challenge the jealous leader of the baboon troop, but the violence of their confrontation leaves Bakari facing a devastating decision that will change his destiny. The wild dog family, led by male Jasari, is also facing a battle when Zalika and her clan of hyenas declare war on the young family, hoping to force them out of their territory. A long running feud begins. When teenage elephant Tembo behaves badly and falls out with another herd, his mother Nalla has to decide his future. How will both Nalla and Tembo handle the difficult decisions they are forced to make?

S1E4 • Serengeti • 2019 • Nature

59:03

Antarctica - the coldest, windiest, most hostile continent. Only the toughest can survive here. From Weddell seals that grind back the ice with their teeth, to colourful starfish carpeting the seabed beneath the ice. Huge colonies of king penguins crowd any ice-free land, and four tonne elephant seals fight for territory on the beach. Life comes here because the ocean that surrounds the continent is incredibly rich. Thousands of penguins, seals, albatross, and over a hundred great whales feast on krill baitballs. However, the ocean here is warming and with that comes an uncertain future. (Number of days filming: 236)

S1E1 • Seven Worlds, One Planet • 2019 • Nature

49:59

The penultimate episode focuses on the relationships between invertebrates and plants or other animals. It begins with ants and aphids: the former 'herd' the latter and protect them in return for secreted honeydew.

Part 4 • Life in the Undergrowth • 2005 • Nature

20:57

A look at how a bird could sing without using its voice and how an octopus could simply disappear from his aquarium tank.

S1E7 • Nature's Strangest Mysteries: Solved • 2019 • Nature

58:59

In Kenya, Chris embarks on a journey through time to uncover how a creature as vast, complex and charismatic as the elephant came to be. It's a story of innovations, lucky breaks and unlikely partnerships.

S1E1 • Evolution • 2026 • Nature