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Marshy outposts capture the sound of frogs – and change

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Tamarac National Wildlife Refuge – In a remote northern Minnesota forest, biologist Lowell Deede makes his way to a small wetland to check an electronic recorder.

It looks like a wildlife camera that people strap on trees. But instead of a lense, it has microphones sticking out each side like ears. The recorder captures the sounds of frogs, birds and other wildlife in the marshy spot for five minutes every hour, seven days a week.

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