* Wolves: Wolves are predators of grizzly bears, especially cubs. Wolves may also compete with grizzly bears for food.
* Mountain lions: Mountain lions are predators of grizzly bears, especially cubs. Mountain lions may also compete with grizzly bears for food.
* Humans: Humans are the biggest threat to grizzly bears. Grizzly bears are often hunted and killed for their fur, meat, and claws. Human activities, such as logging and development, can also destroy grizzly bear habitat.