In the rainforests of Australia, the giant cassowary is in danger of extinction from a foreign invader. Subscribe: http://bit.ly/BBCEarthSub Watch more: Planet Earth http://bit.ly/PlanetEarthPlaylist Blue Planet http://bit.ly/BluePlanetPlaylist Planet Earth II http://bit.ly/PlanetEarthIIPlaylist Planet Dinosaur http://bit.ly/PlanetDinoPlaylist Conservation short. Seven Worlds, One Planet Episode 4 'Australia' Millions of years ago incredible forces ripped apart the Earth’s crust creating seven extraordinary continents. Seven Worlds, One Planet, narrated by Sir David Attenborough, will reveal how each distinct continent has shaped the unique animal life found there. Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll...
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