Invaders from the Deep • 2017 • episode "2/8" • Great Lakes Wild

53:37

This instalment is the first of several to concentrate on mammals. The platypus and the echidna are the only mammals that lay eggs (in much the same manner of reptiles), and it is from such animals that others in the group evolved. Since mammals have warm blood and most have dense fur, they can hunt at night when temperatures drop. It is for this reason that they became more successful than their reptile ancestors, who needed to heat themselves externally. Much of the programme is devoted to marsupials (whose young are partially formed at birth) of which fossils have been found in the Americas dating back 60 million years.

9/13 • Life on Earth • 1979 • Nature

28:28

This episode focuses on the Jurassic period, a time when the first giant killers stalked the Earth and lurked in the seas; a time when the slightest advantage meant the difference between life and death. In North America the iconic allosaurus, an ambush hunter with a lethal bite, dominated. Not even the heavily-armoured stegosaurus was safe from this killer, and incredible evidence reveals a glimpse of a vicious battle between these two giants. Life in Jurassic oceans was no easier; in 2008, a fossil was dug out of a frozen island high in the Arctic. It was a colossal marine reptile, twice as big as most ocean predators, at 15 metres long and weighing about 45 tonnes. This was Predator X. Its skull alone was nearly twice the size of a tyrannosaurus rex's, and its bite force unmatched by anything in the Jurassic seas. The balance of power between predator and prey is a fine one, as prey continually evolves different ways to avoid predators. But for the most successful and enduring predators, the battle to survive has always been tipped in their favour.

4/6 • Planet Dinosaur • 2011 • Nature

70:41

Two hundred million years ago there was an extraordinary development in the history of life: an ancient group of reptiles made a giant evolutionary leap into the skies. In this groundbreaking, BAFTA winning, documentary, David Attenborough travels back in time to discover how and why these creatures took flight, and why after 150 million years of aerial domination they vanished. Using state of the art CGI, and based on new finds and the latest research, Flying Monsters recreates these spectacular creatures and takes us into their world. Beginning on Dorset’s 'Jurassic Coast', David’s journey takes him to sites around the world, from Southern France to New Mexico. With the help of a team of scientists he unravels one of palaeontologys enduring mysteries, how did lizards the size of giraffes defy gravity and soar through prehistoric skies? Driven by the information he finds as he attempts to answer these questions, Attenborough finds that the marvel of pterosaur flight has evolutionary echoes that resonate even today.

2011 • Nature

58:30

In nature, living long enough to breed is a monumental struggle. Many animals and plants go to extremes to give themselves a chance. Uniquely, three brother cheetahs band together to bring down a huge ostrich. Aerial photography reveals how bottle-nosed dolphins trap fish in a ring of mud, and time-lapse cameras show how the Venus flytrap ensnares insect victims. The strawberry frog carries a tadpole high into a tree and drops it in a water-filled bromeliad. The frog must climb back from the ground every day to feed it. Fledgling chinstrap penguins undertake a heroic and tragic journey through the broken ice to get out to sea. Many can barely swim and the formidable leopard seal lies in wait.

1/10 • Life • 2009 • Nature

46:23

From mountain zebras to shy and secretive caracals, Karoo National Park showcases a diversity of creatures who have adapted to demanding environmental conditions. Scale the varying altitudes of this nature reserve's vast landscape.

4/9 • Great Parks of Africa • 2017 • Nature

46:23

Two billion years ago, a giant meteorite crashed into southern Africa's interior plateau, forming a six-mile-deep crater. Today, the site of this cataclysmic event is the Vredefort Dome--a dazzling and rich ecosystem of unique plant and animal life.

2/6 • Africa's Wild Horizons • 2017 • Nature