Study: Mockingbirds can tell people apart, react

WASHINGTON (AP) -- Mockingbirds may look pretty much alike to people, but they can tell us apart and are quick to react to folks they don't like. Birds rapidly learn to identify people who have previously threatened their nests and sounded alarms and even attacked those folks, while ignoring others nearby, researchers report in Tuesday's edition of Proceedings of the National Academy of Sciences....

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