Ken Rosenberg is an applied conservation scientist at the Cornell Lab of Ornithology in Ithaca, New York.
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11:59
A Troubling Decline In North American Birds
A study says the bird population in North America today may be almost 3 billion birds smaller than in 1970.
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22:35
Can Conservation Efforts Save the Birds?
A look at the effects of conservation efforts and climate change on bird populations in North America.