News Alert: North America has lost 29% of its birds since 1970, study finds. Experts blame habitat loss, pesticides, light pollution and cats.
A massive study of bird populations, using decades of survey data as well as weather radar readings of migratory flocks, shows the United States and Canada have lost 3 billion birds in the past 50 years. The declines have hit sparrows, finches, warblers, thrushes, swallows and many other familiar groups.
A massive study of bird populations, using decades of survey data as well as weather radar readings of migratory flocks, shows the United States and Canada have lost 3 billion birds in the past 50 years. The declines have hit sparrows, finches, warblers, thrushes, swallows and many other familiar groups.
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