An unusually large flock of young kea visiting Aoraki Mount Cook National Park has become part of a trial to track the movements of this far-flying parrot.

New Zealand's endangered Kea parrots are the only alpine parrots in the world, as well as the only parrots who've been caught on camera redirecting traffic.

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Sir David Attenborough narrates a documentary about the Kea, the world's only alpine parrot. Playful and destructive, it attacks cars, starts landslides and terrorises New Zealand ski resorts but ...