ocr: The wing beat is very distinctive, he explains. But it would be even easier to identify them if we weren'tin - - a helicopter with all this noise. It's one of those birds which very helpfully calls out its own name when it's flying. Kea! Kea! Kea! Birdwatchers love them for that. It would be great if the Pallas's grasshopper warbler would learn the same trick. Make warbler identification a lot easier.'
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