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This hummingbird makes the highest-pitched call of any bird

National Geographic April 27, 2018
Research led by Claudio Mello, M.D., Ph.D., suggests the high-pitched noises of black jacobin hummingbirds are well above the normal hearing range of other birds; Mello says, “One possibility is they evolved to be able to sing what other birds cannot hear, and can hear back from other birds on their own private channel.”
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