PAUL WILLIAMS / SCIENCE PHOTO LIBRARY PAUL WILLIAMS / SCIENCE PHOTO LIBRARY
Black bear (Ursus americanus) preparing for hibernation. The American black bear is native to North America. It is the continent's smallest and most widely distributed bear species. Hibernation in black bears typically lasts 3-8 months, depending on regional climate, with them entering their dens around October-November. Photographed in Maine, USA.
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