Signals and Songs • 1998 • episode "S1E6" • The Life of Birds

52:11

Every year, the pipistrelle bat undertakes a mysterious migration. This discreet journey covers thousands of kilometers and triggers puzzles that scientists are still trying to understand today. Thanks to cutting-edge technology, we will track the bats on their journey.

2/4 • Secret Migrations • 2019 • Nature

48:03

The rains are late. It is the most brutal time of year. Babies born into drought face starvation. The weak and the injured are weeded out. Everything is desperate for rain. When it finally arrives, it is a downpour on an enormous scale. Alien creatures emerge into a different world. The wet season begins.

3/3 • The Big Dry • 2017 • Nature

47:53

The Cave of Swallows in Mexico is a 400m vertical shaft, deep enough to engulf the Empire State Building. The Lechuguilla cave system in the USA is 193km long and 500m deep with astonishing crystal formations hanging from its chambers. Although often overlooked, caves are remarkable habitats with equally bizarre wildlife. Cave angel fish cling to the walls behind cave waterfalls with microscopic hooks on their flattened fins. Cave swiftlets navigate by echo-location and build nests out of saliva. The Texas cave salamander has neither eyes nor pigment. Unique access to a hidden world of stalactites, stalagmites, snotites and troglodytes brings a wealth of surprises.

4/11 • Planet Earth • 2006 • Nature

58:54

Sophie looks at one skill in particular that seems to give humans an advantage over all other animals - our superior talent for language. She explores what language really is, and how close other animals come to having it. She considers the world of primates and the theory that some apes may communicate through sign language, and reveals how, even in the womb, humans start to practise making the mouth movements needed for speech. But language isn't just a power to combine words. Professor Scott explores how we convey information through the tone of voice, our accents and the pace and pitch of our speech. But in a world when we regularly talk to computers, she also shows why scientists need to develop machines that can understand the subtleties of our speech. Finally, she looks at language in this digital age and explores the role that emojis play.

3/3 • Royal Institution Christmas Lectures: The Language of Life • 2017 • Nature

89:08

Thanks to a recent remarkable discovery in the BBC's film vaults, the best of David Attenborough's early Zoo Quest adventures can now be seen as never before, in colour, and with it the remarkable story of how this pioneering television series was made. First broadcast in December 1954, Zoo Quest was one of the most popular television series of its time and launched the career of the young David Attenborough as a wildlife presenter. It completely changed how viewers saw the world, revealing wildlife and tribal communities that had never been filmed or even seen before. Broadcast ten years before colour television was seen in the UK, Zoo Quest was thought to have been filmed in black and white, until now. Using this extraordinary new-found colour film, together with new behind-the-scenes stories from David Attenborough and cameraman Charles Lagus, this special showcases the very best of Zoo Quest to West Africa, Zoo Quest to Guiana and Zoo Quest for a Dragon in stunning HD colour for the very first time.

2016 • Nature

48:02

Palau has set up the world's first shark sanctuary-a California-sized marine zone where hunting these endangered predators is strictly prohibited. Can this tiny island-nation defend against a sophisticated army of poachers? Join the front lines to save one of the ocean's most cherished and endangered predators.

8 • Great Blue Wild • 2017 • Nature