Southern Pacific rattlesnakes pose the biggest threat in California , while Arizona's deadliest species is the western diamondback rattlesnake. (Getty Images)Alligators also rank as the deadliest animal in Florida and Texas, with the American alligator specifically topping Florida's list. Large mammals also appear prominently throughout the report, with black bears ranking as the deadliest animals in Tennessee and Wisconsin. Whitetail deer were also identified as the deadliest animals in Arkansas, Ohio, West Virginia and Pennsylvania. Canines, including dogs and coyotes, rank as the deadliest animals in five states.