Bears are animals of the family Ursadae, and are classified as dog-like carnivians. They are particularly vicious quadrupedal predators, known to attack anything in their territory.
Venom Snake encountered some during his missions for Diamond Dogs in the 1980s.
Behind the scenes
Journalists covering Metal Gear Solid V: The Phantom Pain confirmed that the player can occasionally encounter bears during gameplay. They also confirmed that they can be captured, although they noted that it would take a lot of effort to do so. In real life, Afghanistan is home to both the Asiatic black bear (Ursus thibetanus) and the Asiatic brown bear (Ursus arctos). [1][2][3]