With the help of some surprising creatures from around the world, this series sets out to discover how animals take to the air, defying the force all airborne animals must conquer, gravity. Part 3: Crowded Skies This episode features a creature that creates sound out of thin air with the world's fastest courtship display and arguably the world's most aggressive bird. In a South American jungle, there's 'hunt and evasion' flying during the night, as bats and moths fight for the upper hand in one of the world's oldest arms races. Plus a camera films a giant flock to unlock the secrets that keep half a million birds from colliding in the same air space.
David Attenborough reviews the scientific discoveries that have transformed our view of life on earth during his lifetime. How and where did life first begin? How do continents move? How do animals communicate? And why do they behave the way they do? Sir Attenborough shares his memories of the scientists and the breakthroughs that helped shape his own career. He also recalls some of his most memorable attempts to bring new science to a television audience - by standing in the shadow of an erupting volcano as lumps of hot lava crashed around him, by being charged by a group of armed New Guinean tribesmen and the extraordinary sight of chimps hunting monkeys, captured on camera for the first time by Attenborough and his team.
Every summer, the frozen waters of Hudson Bay partially thaw for a few short months. For migrating beluga whales, it's a seasonal window of feeding and breeding opportunities, but for polar bears, it's a famine-filled test of their survival. Explore the shifting fortunes of a vibrant Arctic world.