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

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Almost 7 million birds are killed each year when they fly into communication towers that broadcast TV and radio and make cellphone conversations possible.

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Worse, the towers often kill birds that are already rare.

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So says a study in the journal Biological Conservation.

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For example, tower impacts kill more than 2,000 yellow rails per year.

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That's roughly 9 percent of the total population.

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Ninety-seven percent of all birds killed are songbirds, especially warblers.

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The red-eyed vireo suffers some of the biggest losses, some 581,000 deaths annually,

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though that represents less than 1 percent of its population.

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The Southeast and Midwest lead the country in tower-bird collisions.

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That's because these regions have the largest concentrations of the tallest towers, up to 900 feet high.

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While all of the more than 80,000 communication towers in North America cause problems,

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the roughly 1,000 tallest towers cause 70 percent of the bird deaths, luring birds to their doom with red warning lights that are always on.

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A partial solution is relatively simple: replacing the always-on red lights with blinking ones could cut the deaths by as much as 70 percent.

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Otherwise, Twitter could have a monopoly on tweets.

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

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