Climate Change is Altering the Range of Birds. SeattlePI, February 10, 2009. "On Tuesday, the National Audubon Society released a report [Birds and Climate Change: Ecological Disruption in Motion, PDF, 14 pp] based on this annual count indicating that half of 305 selected bird species in North America -- a sample that includes robins, gulls, owls and other common species -- are on average spending winter about 35 miles farther north than they did 40 years ago. Birders discovered that one species also found in the Northwest, the purple finch, has shifted its winter grounds more than 400 miles to the north -- from about the San Francisco Bay Area to Olympia... Bird ranges can expand and shift for many reasons, among them urban sprawl, deforestation and the supplemental diet provided by backyard feeders. But researchers say the only explanation for why so many birds over such a broad area are wintering in more northern locales is global warming."
2009-02-10
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