How the hummingbird got his whistle

American zoologists say they can settle a long-running debate about how male hummingbirds are able to whistle at females of the species to try to entice them into mating. The Anna’s hummingbird (Calypte anna), native to the US West Coast, makes the brief but loud chirp as he dives to impress females that venture into his territory.

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Updated: February 17, 2012 — 7:38 pm

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