New study finds U.S. and Canada have lost more than 1 in 4 birds in past 50 years- All Images

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New study finds U.S. and Canada have lost more than 1 in 4 birds in past 50 years

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Since 1970, the U.S. and Canada have lost nearly 3 billion birds, a massive reduction in abundance.

Credit: Cornell Lab of Ornithology

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