In the western US, grizzlies are huge, powerful carnivores. When threatened, grizzlies can be dangerous.
Alligators, found in watery settings in the Southeast, are dangerous if provoked. They have powerful jaws and can attack when threatened.
various US states have various rattlesnake species. Avoid their hazardous venomous bites.
Mountain lions (cougars or pumas) live across the US. Attacks on humans are infrequent, although encounters can be dangerous, especially in populated regions.
Black widow spiders are deadly and found across the US. Their bites rarely kill, but they can be painful.
One of the largest venomous snakes in North America, the Eastern Diamondback Rattlesnake lives in the Southeast. Their bites can be dangerous if untreated.
Some US states have brown recluse spiders. Their bites can induce necrotic skin lesions, however they are not necessarily deadly.
Coyotes are dangerous in metropolitan areas around the US. They usually avoid humans but can turn violent if they see us as food.
Despite not being dangerous, bald eagles have formidable beaks and talons. Respecting their space is vital since approaching them is risky.
Some US estuaries and rivers have bull sharks. In some conditions, their aggression might threaten people.