Big Birds Can't Fly
Nature Season 34

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Episode Info

David Attenborough examines what led some birds, such as the ostrich, emu, rhea, cassowary and kiwi, to evolve as they did. The five belong to the ratite group of birds, and rely on traits other than flight to survive. For example, the ostrich-the largest bird in the world-can run upwards of 40mph, which is faster than most predators on the African plains; the cassowary, native to northern Australia, possesses dagger-sharp claws; and New Zealand's kiwi only comes out after dusk.