Africa • 2011 • episode "Part 5" • The Magic of The Big Blue

4:17

Traveling is extremely arduous for microscopic sperm -- think of a human trying to swim in a pool made of...other humans.

TED-Ed • Nature

58:19

Going down into these narrow flooded passageways is not for the faint-hearted but, with only an estimated one percent of the caves explored, it is an opportunity for the team to write themselves into cave diving history, by pushing further in than anyone has before. This is a challenge that tests even the most accomplished cave divers. Steve must face the terrors of being lost in an underwater silt cloud in a cave. But there is a bigger issue at stake. All life in the Yucatan depends on the fresh water in this network of caves, but it's being contaminated by human development. With every metre the team maps, it adds to the knowledge of the system, which, in turns, helps protect it for future generations.

Undiscovered Worlds with Steve Backshall • 2019 • Nature

48:03

The sea turtle is one of the oldest animals on Earth. These ancient mariners pre-date the dinosaurs and have existed for over 100 million years, but now all seven of the surviving species are endangered.

S1E5 • Arabian Seas • 2018 • Nature

52:00

Exploring an unknown world 10,000 m beneath the waves. After capturing a giant squid on film, NHK's deep-sea film crew explores our planet's deepest point The Mariana Trench is nearly 7 miles deep. The water pressure is immense, and it's a world that's long been out of our reach. What creatures could survive such hostile conditions? This is an expedition to explore the earth's deepest frontier. Narrated By David Attenborough.

Part 3 • Deep Ocean • 2018 • Nature

26:40

Often referred to as the gray ghost or ghost of the mountains, this animal's rarity and elusiveness was legendary. In the past, it was known as the ounce, but today we've settled on the name snow leopard.

S1E2 • The Secret Lives of Big Cats • 2019 • Nature

52:57

Animal Reunions have captured the imaginations of millions of people worldwide. YouTube is full of animal reunion stories - moments that illustrate and capture genuine affection and emotion between and among species. These rare moments provide a fleeting window into the emotional capacities of animals and their ability to form bonds with humans. But can wild animals really feel joy, devotion and love? Most animal lovers are convinced that they do, and now scientists are beginning to agree as we discover the stories that bring those animal emotions to life. We meet orphaned elephants in Kenya who have learned to trust their nursery keepers even after they lost their families at the hand of man - and witness a deep bond revealed as the head keeper travels to the National Park to see if his fully grown elephants remember him. We meet Damian Aspinall, the first man to release a captive-bred family of gorillas back to the wild, and see his reunion with one of those gorillas, proving a bond that may last a lifetime. We also meet Jane Goodall, the legendary chimpanzee researcher who was once heavily criticized for her claims about animal emotions; and Rebeca Atencia, the veterinarian who runs a Congolese chimp sanctuary set up by Goodall, as she travels to find the orphan chimpanzee she raised and released back into the wild. Through these incredible stories about human-animal relationships, illuminated by interviews with some of the world's most eminent ethologists and academics, this film sets out to question not only the emotional intelligence of animals but the so-called divide between us and them.

PBS Nature • 2016 • Nature