Cubs are born while the mother bear is hibernating. Bears have a few enemies. In North America, bears are sometimes killed by packs of wolves. In Asia, large tigers kill and eat brown bears and Asiatic black bears. Also, male bears will sometimes kill cubs and female bears.
People are a bear's biggest enemy.
People kill bears for sport. Bears are also killed to get parts of their bodies which are used by some people. Poaching bears is against the law. More bears are dying each year than are being born. Polar bears and American black bears are safe for now.