David Attenborough investigates two shells that have proved to be winners in evolution: the tortoise's shell and the shells of birds' eggs. The ostrich egg is so strong it is possible for a person to stand on it without it breaking, but how does the chick break out of this fortress? The evolution of the tortoise shell was for a long time a mystery and this bony box offers a lot more than just protection.
Documentary about the world's first National Park, filmed over a two-year period. Ch1. Fire and Ice Yellowstone's residents try to survive the harshest of winters as temperatures plummet way below zero. Hibernation and migration offer an escape for some but, for others, paradise becomes a winter nightmare. Ch2. Return of the Predators Looks at the battle to stay on top of the food chain. Wolves, grizzlies and mountain lions play a critical role in keeping Yellowstone in balance and must do what it takes to survive. Ch3. Life on the Wing The park faces the dramatic consequences of famine, fire, floods and a big freeze. Ch4. Down the River Wild The Yellowstone River travels a 700-mile journey through a spectacular landscape, revealing trumpeter swans, daring river otters, and grizzlies and bison fording treacherous rapids.
2019 • Nature
In the balmy tropical Atlantic, everything from dolphins, manatees and whale sharks to sunbathing jellyfish thrive in the Caribbean's warm, sheltered waters, fringed with coral reefs and rich mangrove forests. But extreme heat in Africa unleashes terrifying hurricanes, causing chaos across the region.
The third instalment examines the spiders and others that produce silk. Attenborough visits New Zealand's Waitomo Caves, which are inhabited by fungus gnats whose illuminated larvae sit atop glistening, beaded filaments to lure their prey.
Richard Hammond continues his exploration of weird and wonderful animal abilities by focusing on super-senses, and discovers how those same animal senses have inspired some unlikely human inventions. Richard gets buried in a Californian gold mine, attempts to talk to a rattlesnake by telephone, and is taken for a ride by a monster truck that drives itself. Along the way, he encounters elephants who can talk to each other through solid rock; seals who use their whiskers to sense the shape, size, speed and direction of an object that passed over thirty seconds earlier; and a blind cyclist who relies on fruit bats to get him safely down a twisting mountain bike trail.