One Year on a Beaver Dam in Minnesota

Footage from a trail cam at a beaver dam just south of Voyageurs National Park shows us a variety of animals using it as a river crossing. Over a year's time, we see wolves, bears, deer, beavers (of course), and other creatures, as well as the changing of the seasons. The dam is so sturdy that vegetation thrives on top, and the resulting pond is calm enough to freeze in winter. Good work, beaver! (via Metafilter)