A loon swims on Squam Lake, Friday, June 25, 2021, in Holderness, N.H. Researchers in New Hampshire have long struggled to understand why loon numbers have stagnated on the lake, despite a robust effort to protect them. They are investigating whether contamination from PCBs could be impacting reproduction and believe oil laced with the chemicals was used on nearby dirt roads decades ago. (AP Photo/Elise Amendola)
Elise Amendola
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