Western Black-tailed Rattlesnake

Crotalus molossus

Field notes

The black-tailed rattlesnake (Crotalus molossus) is a venomous pit viper species found in the southwestern United States and Mexico. Four subspecies are currently recognized, including the nominate subspecies described here.

Range

United States

Greener is more native, amber more introduced; paler is less certain. How this was decided