Bears are large, powerfully built mammals belonging to the family Ursidae. Found in a wide variety of habitats across the globe, from arctic tundras to tropical forests, they are characterized by their stocky bodies, short tails, and non-retractile claws. Bears are generally omnivorous, with their diet varying depending on species and availability, ranging from berries and roots to insects, fish, and other mammals. While most bear species are solitary animals, they are known for their intelligence and adaptability, and some species, like grizzly bears, can be quite dangerous to humans if provoked or threatened.