(UNDATED) - Birdwatchers beware: a new study suggests that the population of some common Indiana birds is half of what it was 40 years ago.
The National Audubon Society says its own bird count, combined with figures from the U.S. Geological Survey, shows that nature lovers are less likely to spot redheaded woodpeckers, field sparrows, and northern bobwhite birds in Indiana.
Natural history author Scott Widensaul puts part of the blame on suburban sprawl and climate change.
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