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Description
Common names: black-tailed rattlesnake, green rattler, northern black-tailed rattlesnake, dog-faced rattlesnake, dog-headed rattlesnake, mountain diamondback. (Crotalus molossus)
Location: southwestern United States in Arizona, New Mexico and west and central Texas, and Mexico as far south as Oaxaca. Also found in the Gulf of California on San Estéban Island and Tiburón Island.
Size: averages 76–107 cm in length. Large specimens are usually not much more than 100 cm, although lengths of 125.0 cm (Gloyd, 1940), 125.7 cm (Klauber, 1972) and 129.5 cm (Shaw & Campbell, 1974) have been reported. The females tend to be larger than the males.
Diet: rodents, other small mammals, birds, and small reptiles.
Conservation status: Least Concern

Description
Common names: black-tailed rattlesnake, green rattler, northern black-tailed rattlesnake, dog-faced rattlesnake, dog-headed rattlesnake, mountain diamondback. (Crotalus molossus)
Location: southwestern United States in Arizona, New Mexico and west and central Texas, and Mexico as far south as Oaxaca. Also found in the Gulf of California on San Estéban Island and Tiburón Island.
Size: averages 76–107 cm in length. Large specimens are usually not much more than 100 cm, although lengths of 125.0 cm (Gloyd, 1940), 125.7 cm (Klauber, 1972) and 129.5 cm (Shaw & Campbell, 1974) have been reported. The females tend to be larger than the males.
Diet: rodents, other small mammals, birds, and small reptiles.
Conservation status: Least Concern