The Himalayan brown bear (Ursus arctos isabellinus), also known as the Himalayan red bear, Isabelline bear or Dzu-Teh, is a subspecies of the brown bear and is known from northern Afghanistan, northern Pakistan, northern India, Nepal and Tibet. It is the largest mammal in the region, males reaching up to 2.2 m (7 ft) long while females are a little smaller. These bears are omnivorous and hibernate in a den during the winter. Although present in a number of protected areas, they are becoming increasingly rare because of loss of suitable habitat and persecution by humans, and have become "critically endangered". This bear (as the Dzu-Teh) is thought to be the source of the legend of the Yeti.