When Does Life Begin? • episode "S4E02" • Through the Wormhole

28:58

In this episode, Iolo investigates the courtship and nesting behaviour of birds, including the amazing courtship display of great crested grebes at a reservoir near Pontypool, the impressive sky dance of hen harriers in the dramatic Cambrian Mountains, how nuthatch use mud like cement to prepare their nest in a woodland near Harlech, and why long-tailed tits near Newtown are exceptional nest builders. On the Lleyn Peninsula near Trefor, he looks at why one colony of shags nest earlier than any others in Wales, and in Pembrokeshire he finds out where house martins nested before they used our buildings. Iolo also looks at the variety of places birds like to nest, from little ringed plovers on shingle banks along the River Tywi to puffins underground on Skomer.

S1E2 • Secret Life of Birds • 2012 • Nature

54:11

In the Pacific, the quest to multiply has spawned a stunning array of unusual behaviors and adaptations. There are forest penguins with a tenuous marriage, the secret rendezvous of great white sharks, and the tale of male pregnancy.

S1E4 • Big Pacific • 2017 • Nature

58:10

The incredible anticipation of the annual great migration is being felt by all of the Serengeti's families as they wait with great desperation for it to arrive. The land continues to get hotter and hunger start to bite as food becomes ever more scarce for the predators. But life continues, with Kali the lioness and her sister entrusting their cubs to their new male babysitter, Sefu, with near-disastrous results. Bakari the baboon is shocked when a trip across the river to collect crocodile eggs looks like it will end in tragedy for his new female, Cheka, and the adopted baby. His rivalry with the troop leader then puts him and the baby in more danger. A family of wild dogs moves in, led by male Jasari. With a huge litter of pups, Jasari is ready to take advantage of the coming feast, but until the migrating herds arrive, it is a struggle to survive. Shani, a female zebra, is leading her family on the great migration. She is forced to stop temporarily to give birth to her foal, but as soon as he can run, they are off again heading towards the great river. When the herds finally arrive at the river, they find it teeming with crocodiles, and zebra mother Shani has to decide how and when she can take her newborn foal across the treacherous water. Lying in wait and watching them carefully is a large mother crocodile, who is determined to eat them if they try. With the great migration now in full flow, there are winners and losers on both sides. The awe-inspiring spectacle it brings are part of the deep seasonal rhythms that govern all life in the Serengeti.

S1E3 • Serengeti • 2019 • Nature

50:20

Five heroes, each with a unique power, fighting to survive, killing to reign supreme over the Savage Kingdom.

S1E6 • Savage Kingdom • 2016 • Nature

44:57

A look at marine wildlife around the world, Oceans cover more than 70 percent of our planet. This is where life on earth began. And where it continues to surprise those looking for animal encounters with bite. Scientists are discovering new species every day here, on our shorelines, on our reefs and out to sea. These watery wonderlands are home to the largest, and indeed many of the smallest, creatures on Earth.

S1E4 • World's Greatest Animal Encounters • 2020 • Nature

52:18

David discovers the plants that have evolved to shed their dependency on water enabling them to survive in the driest environments. The story begins at midnight in midsummer as David steps into the Princess of Wales Conservatory to witness the extraordinary nocturnal blooming of a cactus. The Queen of the Night, with its giant flowers, is the centre piece of a stunning symphony of cacti blooms that burst open in the desert (and at Kew) at night. In a mesmerizing 3D slow motion sequence, we discover the extraordinary connections between cacti and their natural ...

S1E3 • Kingdom of Plants • 2012 • Nature