American martens have been discovered on Manitou and Stockton islands in the Apostle Islands National Lakeshore for the first time in more than 40 years, park officials say.

An American marten was verified on Manitou Island in 2014 when a visitor took a photo of it running between his legs.

This past spring, when researchers began checking thousands of images from the 30 trail cameras they had placed on Stockton Island last winter, they were surprised to see a few images of American marten, a small mammal that’s on Wisconsin’s state endangered species list.

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