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Between 100 million and 1 billion birds die each year from hitting glass, according to Daniel Klem Jr., an ornithologist at the Muhlenberg College in Allentown, Penn.

( Allen J. Schaben / Los Angeles Times )

Between 100 million and 1 billion birds die each year from hitting glass, according to Daniel Klem Jr., an ornithologist at the Muhlenberg College in Allentown, Penn.

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