North American migratory birds have been getting smaller over the past four decades, and their wingspan wider. The changes appear to be a response to a warming climate.
A staggering 600 million birds die every year in the United States after colliding with tall buildings. And Chicago, with its skyscrapers and location on a major migration path, is perhaps the biggest killer.
But for Dave Willard, a collections manager emeritus at the city's Field Museum, the dead birds have been an unexpected scientific windfall. Each morning in the spring and fall, when birds make their epic journey between Canada and Latin America, he has headed out to pick up the dead animals from the street. "I've just stopped for the season. The number of birds we get each day is highly variable depending on whether it's a big day of migration.
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