The western diamondback rattlesnake (C. atrox) is the longest rattlesnake found within the United States, with the largest one ever recorded being 8.5 feet in length. Animals such as prairie dogs, rats, mice, chipmunks, voles, gophers, ground squirrels, and rabbits make up around 95% of the snake’s diet. The western diamondback rattlesnake or Texas diamond-back (Crotalus atrox) is a venomous rattlesnake species found in the southwestern United States and Mexico. However, other venomous snakes may rival this species in weight. Crotalus oreganus is a venomous pit viper species found in North America in the western United States, and parts of … In general, adult males are slightly larger than females. Compared to most snakes, they are heavy-bodied, although some African vipers are much thicker. Elevational Range: Generally found at elevations less than 1000 ft. (300 m). It is likely responsible for the majority of snakebite fatalities in northern Mexico and the greatest number of snakebites in the U.S. No subspecies is currently recognized. The eastern diamondback rattlesnake is the largest rattlesnake species and is one of the heaviest known species of venomous snake, with one specimen shot in 1946 measuring 7.8 ft (2.4 m) in length and weighing 15.4 kg (34 lb). The snake may occasionally also consume birds, lizards, amphibians, fish, and even invertebrates such as … What Do Western Diamondback Rattlesnakes Eat? The much longer but more slender Members of the genus Crotalus range in size from only 50–70 centimetres (20–28 in) (C. intermedius, C. pricei), to over 150 centimetres (59 in) (eastern and western diamondback rattlesnakes). The western diamondback rattlesnake’s diet consists mainly of small mammals. On average they range from 3.5 to 4.5 feet. Western diamondback rattlesnakes occupy a geographic range that includes western Arkansas, eastern and south-central Oklahoma, Texas (except the extreme east and northern panhandle), central and southern New Mexico and Arizona, extreme southern Nevada, southern California, and southward into Mexico to extreme northeastern Baja California and northern Sinaloa in the west, and northern … Undivided anal scale. Common names: Northern Pacific rattlesnake, Pacific rattlesnake, more. Diagnostic Features: 5. The western diamondback rattlesnake, or Crotalus atrox, a member of the family Viperidae, the subfamily Crotalinae, and the genus Crotalus, has such a hold on the human psyche that it has been a symbol of the American Southwest from prehistoric into historic times.It figures in ancient mythology, ceramics and rock art and in modern story and media. Description. Like the eastern diamondback, it has a distinct diamond dorsal pattern; however, the western diamondback’s pattern is much lighter than the darker eastern diamondback’s. Notes on Taxonomy ... Crotalus atrox - Western Diamond-backed Rattlesnake (Stebbins 2003, 2012) Crotalus atrox - Western Diamondback Rattlesnake (Stebbins 1966, Klauber 1982, Stebbins 1985) Crotalus atrox - Western Diamond Rattlesnake (Wright & Wright 1957) (AKA Adobe Snake, Arizona Diamond Rattlesnake, Coon … Western Diamondback Rattlesnake Crotalus atrox.