The Deadliest American Animals You Wouldn't Want To Run Into

Brown or Grizzly Bear

Found mainly in Idaho, Montana, Washington, Wyoming, and Alaska, grizzlies are powerful and unpredictable predators known for occasional attacks on humans, especially females with cubs or hungry bears fresh from hibernation.

American Black Bear

Widespread across the US with about 80,000 in population, these bears are strong, excellent swimmers, and climbers. They occasionally attack humans, often starting as encounters with dogs, resulting in about one fatal.

Polar Bear

Among the largest predators globally, with 4,000 to 7,000 in Alaska's northern regions. Rarely encountered by humans, they're extremely dangerous, with increasing human interactions as melting ice forces them south in search.


One of the largest venomous snakes in the US, responsible for 7,000 to 8,000 bites annually, with about five fatalities. The eastern diamondback is the deadliest, found in the southeast, preying on small mammals and birds.

Brown or Grizzly Bear

Known for its vibrant coloration, coral snakes are venomous but less aggressive than rattlesnakes. Found in eastern, western, and Texas varieties, their bites are rare but potentially deadly due to neurotoxic venom.

North American Copperhead

Found in southern and eastern states, copperheads are responsible for more bites than any other US snake species. Their venom can cause serious tissue damage, though fatalities are uncommon.


Urbanized and mischievous, raccoons are native to North America. They can carry diseases like rabies and may scratch or bite when threatened, though they rarely attack humans unprovoked.