Timber rattlesnakes (Crotalus horridus) are a species of rattlesnake found in the eastern United States. They are known for their passive and slow-moving nature. The timber rattlesnake used to be classified into two subspecies: the timber rattlesnake
The eastern diamondback rattlesnake (Crotalus adamanteus) is the second longest rattlesnake and the most heavily bodied rattlesnake in the United States. It averages about 5 feet in length, but there have been reports of specimens up to 8 feet.
The western diamondback rattlesnake (Crotalus atrox) is the longest rattlesnake found within the United States, with the largest one ever recorded being 8.5 feet in length. On average, they range from 3.5 to 4.5 feet. Like the eastern diamondback, the western diamondback
The Mojave rattlesnake (Crotalus scutulatus) is a species of rattlesnake found in the southwestern United States, extending from California to Texas. Different populations of Mojave rattlesnakes have different venom compositions. Venom experts have divided Mojave rattlesnakes into two groupings
The western rattlesnakes encompass five different subspecies: the southern Pacific rattlesnake (Crotalus oreganus helleri), the northern Pacific rattlesnake (Crotalus oreganus oreganus), the Grand Canyon rattlesnake (Crotalus oreganus abyssus), the midget faded rattlesnake
Pygmy rattlesnakes (Sistrurus miliarius) range from the southeastern U.S. to as far west as eastern Texas. Overlapping species of pygmies integrate. They inhabit several different habitats, including pinewoods, hardwoods, palmetto, adjacent to marshes
The eastern massasauga (Sistrurus catenatus catenatus) is a small, thick-bodied rattlesnake that inhabits shallow wetlands in portions of the United States and Canada. It displays a dorsal pattern of black or very dark brown oval-shaped blotches on a gray or reddish-brown background.