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http://www.cnn.com/2007/TECH/science...ine/index.html
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Quote:
"• 20 common birds have lost more than half their populations in the past 40 years • Birds in decline: Northern bobwhite, field sparrow and boreal chickadee • Factors: Agriculture, habitat loss, pesticides, invasive species, global warming • Health of a bird population often a harbinger of health of other wildlife, humans" |
