A carnivorous mammal belonging to one of eight species comprising the family Ursidae: the brown, American black, Asian black, sun, sloth, spectacled, and polar bear, and the giant panda. They are stocky, mainly large animals with a sense of smell superior to that of dogs. Brown bears (Ursus arctos) are the most widespread, grizzly (U.a. horribilis) and Kodiak (U.a. middendorffi) bears being subspecies. Despite being classed as dog-like carnivores, apart from polar bears (U. maritimus), which feed on marine mammals, and giant pandas (Ailuropoda melanoleuca), which feed on bamboo, most bears are omnivorous. Bears occur naturally throughout North America and Eurasia, with only the spectacled bear (Tremarctos ornatus) in South America, in the Andean region. Most bears inhabit forests and are diurnal. In winter, most bears remain in their dens in a state similar to hibernation.