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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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There's a partridge in a pear tree, two turtledoves, three French hens, four calling birds, six geese, and seven swans.

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Or so goes some the lyrics to the 12 days of Christmas.

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But on December 14th, the annual 21 days of the Christmas Bird Count begin.

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And it's revealing a lot more about birds than just their numbers.

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The effort put together by the Audubon Society since 1900 mobilizes tens of thousands of citizen scientists to get out and count birds.

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Last year, more than 70,000 people from the Arctic Circle to Tierra del Fuego tallied some 60 million different birds, and nearly 2,300 different species.

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Seems that birder competition drives good science.

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Odd things have been noticed in recent times.

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More hummingbirds now winter in the U.S.

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A relative of colorful puffins known as the razorbill has moved hundreds of miles south in search of food, and many washed up on shore dead from starvation.

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But it's not all bad news.

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114 years of data show that bird populations continue to rebound in the continental U.S.and icons like the bald eagle are back.

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As climate change and other threats shift highly mobile animals like birds, the birders will be watching and helping guide appropriate conservation efforts.

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So get out and count!

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello. Thanks for listening.

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