Article: ON THE TRAIL

As temperatures drop and snow flurries begin to fly in November, some Wisconsin wildlife animals begin looking for spots where they can avoid the cold by either hibernating or entering a long winter's sleep.

State wildlife officials say there generally are two kinds of winter sleepers: true hibernators and "light sleepers." True hibernators like bats, woodchucks and ground squirrels sleep very deeply and are almost impossible to wake. A woodchuck's heart rate, for example, goes from 80 beats per minute when active to four to five beats per minute in hibernation. Other true hibernators include snakes, turtles and frogs. Frogs and turtles bury themselves in the mud below the frost line, ...

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