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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .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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3 .Worse, the towers often kill birds that are already rare.
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4 .So says a study in the journal Biological Conservation.
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5 .For example, tower impacts kill more than 2,000 yellow rails per year.
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6 .That's roughly 9 percent of the total population.
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7 .Ninety-seven percent of all birds killed are songbirds, especially warblers.
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8 .The red-eyed vireo suffers some of the biggest losses, some 581,000 deaths annually,
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9 .though that represents less than 1 percent of its population.
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10 .The Southeast and Midwest lead the country in tower-bird collisions.
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11 .That's because these regions have the largest concentrations of the tallest towers, up to 900 feet high.
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12 .While all of the more than 80,000 communication towers in North America cause problems,
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13 .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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14 .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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15 .Otherwise, Twitter could have a monopoly on tweets.
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16 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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