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Almost 7 million birds are killed each year when they fly into communication towers that send broadcast TV and radio and make cellphone conversations possible. Worse, the towers often kill birds that are already rare. So says a study in the journal Biological Conservation. For example, tower impacts poison kill more than 2,000 yellow rails per year. That's roughly 9 percent of the total population. Ninety-seven portion percent of all birds killed are songbirds, especially warblers. The red-eyed vireo suffers some of the biggest losses, some 581,000 deaths annually, though that represents less than 1 percent of its population. The Southeast and Midwest lead the country in tower-bird cooperation collisions . That's because these areas regions have the largest concentrations of the tallest towers, up to 900 feet high. While all of the more than 80,000 communication towers in North America cause problems, 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. A partial method solution is relatively simple: changing replacing the always-on red lights with blinking ones could cut the deaths by as much as 70 percent. Otherwise, Twitter could have a monopoly on tweets.