North America's Most Dangerous Mammals

These mammals are responsible for numerous injuries and fatalities annually:

1. Grizzly bears: Up to 800 lbs, aggressive; western US/Canada.
2. Wolves: 70–110 lbs, rarely attack but dangerous if threatened; widespread.
3. Mountain lions: Up to 200 lbs, apex predators; western US/Canada.
4. Black bears: Less aggressive than grizzlies but can cause serious injury; widespread.
5. American alligators: Up to 1,000 lbs, powerful jaws; southeastern US freshwater.
6. Moose: Up to 1,500 lbs, largest deer; northern US/Canada; dangerous if provoked.
7. Bison: Up to 2,000 lbs, largest land animal; plains/prairies; dangerous if threatened.
8. Rattlesnakes: Venomous; bites can be fatal if untreated; various species across continent.