The emerald ash borer, an invasive beetle that is infesting ash trees in parts of the U.S., has had an impact on the area's woodpeckers. Researchers found a higher population of red-bellied woodpeckers in areas where trees are overrun with the bugs. "One of the easiest ways to find an infested tree when you're out in the field is to find a tree that's been heavily attacked by woodpeckers," said Andrew Liebhold, an insect scientist for the U.S. Forest Service and co-author of the study.

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