From the St. Paul Pioneer Press:

INTERNATIONAL FALLS, Minn. — Have you ever paused at a spot in the woods and wondered, what else walks by here? What’s used this trail in the past week? The past month? The past year?

The researchers at the Voyageurs Wolf Project wondered that and did something to get an answer. They placed a motion-activated video trail camera on a likely looking beaver dam and left it for more than a year.

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