Scientists have different ideas about what’s threatening loon survival in some parts of North America.

By Leslie Nemo

The icons of your summer camping trip are in an unusual situation. Loons — the black and white birds with a distinct and eerie two-note call — spend the warmer months of the year in northern U.S. states and across Canada, returning to the same regional pockets every year to breed. And for some reason, Loons living across New England appear to be thriving, while those in Wisconsin and large parts of Canada are not.

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