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problem varies between species, and with some such as the Gang-gang cockatoo, it is known to be too dangerous to attempt banding. New World vultures also cannot be banded on their legs because they urinate onto their legs, causing corrosion of the bands into a powdery oxide that sticks to the vulture's leg and injures the bird. Dippers are also dangerously handicapped by ringing because the rings induce drag that makes it extremely

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