Warming drives migratory birds north

02/10/2009 | Google

Bird species across North America are traveling farther north during winter hibernation, a phenomenon scientists attribute to global warming. More than half of the 305 bird species that call North America home are traveling an average of 35 miles farther north than they did 40 years ago -- a time period over which average U.S. temperatures grew by 5 degrees Fahrenheit.

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