Snakes, particularly rattlesnakes, are the deadliest animal nationwide, topping the list in 14 states, according to a 2026 report from World Population Review. The report identified a surprising variety of creatures as the leading cause of animal-related fatalities across the United States.
In states like Georgia and Oklahoma, pygmy rattlesnakes pose the greatest danger, while Connecticut and Kansas face threats from timber rattlesnakes. California's deadliest species is the southern Pacific rattlesnake, and Arizona's is the western diamondback rattlesnake. Other rattlesnake species identified as top threats include the prairie rattlesnake in North Dakota, the Mojave rattlesnake in Nevada, and the eastern massasauga in Michigan. Beyond rattlesnakes, the eastern diamondback snake is the top threat in Louisiana, and the cottonmouth snake in Mississippi. Indiana and South Carolina have the eastern and southern copperhead, respectively, as their deadliest snakes, while Hawaii's primary concern is the yellow-bellied sea snake.
Beyond reptiles, several states face risks from insects and venomous marine life. Wasps are the deadliest animal in Iowa, ticks in Missouri, and mosquitoes in New York. Black widow spiders are the main concern in Alabama and Nebraska.
Coastal states have their own unique hazards. Tiger sharks are the deadliest animal in Rhode Island, while bull sharks pose the greatest threat in Maryland and Virginia. The Portuguese man o' war, a venomous marine creature, is listed as the biggest danger in Delaware and North Carolina. While its sting can be deadly in rare instances, it more commonly causes painful welts and skin irritation.
Alligators rank as the deadliest animal in Florida and Texas, with the American alligator specifically topping Florida's list. Large mammals also feature prominently in the report. Black bears are identified as the deadliest animals in Tennessee and Wisconsin. North American black bears pose the greatest threat in Oregon, while American black bears are the top concern in Kentucky and Massachusetts. In contrast, New Mexico's deadliest animal is the mountain lion, and moose are the greatest risk in Colorado, Maine, New Hampshire, and Vermont. Grizzly bears top the list in Idaho, Montana, and Washington, while bison pose the greatest danger in South Dakota and Wyoming. Whitetail deer were identified as the deadliest animals in Arkansas, Ohio, West Virginia, and Pennsylvania.
In Alaska, dogs are listed as the state's most concerning animal despite their common status as household pets. Similarly, coyotes rank as the biggest threat in Illinois, Minnesota, New Jersey, and Utah.
Overall, snakes accounted for the deadliest animal in 14 states. Bears were identified as a threat in eight states, and deer or other large ungulates in 10 states. Canines, including dogs and coyotes, were the deadliest animals in five states. Biting and stinging arthropods such as wasps, mosquitos, and spiders accounted for five states, and marine hazards also represented five states.