Big Birds Can't Fly
Of all the birds he's filmed over the years, David Attenborough finds these big birds the most comical. They are the Flintstones of the bird world - a group whose lineage can be traced back to when dinosaurs walked the earth. The ostrich, the emu, and the rhea - together with the kiwi and the cassowary - are essentially the court jesters of the avian world, because they can't do the one thing that birds are famous for doing. They can't fly. But exactly how - and why - did these birds abandon flight? It's been one of the natural world's great mysteries. And now DNA is ...
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