Western Black-tailed Rattlesnake
Crotalus molossus
Unlike many rattlesnakes that shed their rattle segments easily, this species often retains a long, impressive rattle due to its less aggressive lifestyle.
- Scientific name
- Crotalus molossus
- Taxonomy
- Animalia › Chordata › Reptilia › Squamata › Viperidae › Crotalus
- IUCN Red List status
- Least Concern
- Population trend
- stable
- Biome
- desert
- Habitat
- Rocky canyons, talus slopes, desert scrub, and pine-oak woodlands.
- Diet
- Rodents, woodrats, rabbits, lizards, and occasionally birds.
- Range
- United States (Arizona, New Mexico, Texas), Mexico
- Size
- 75 to 110 cm (30 to 43 inches) in length
- Lifespan
- 15-20 years
- Active
- crepuscular
- Threats
- Habitat loss, vehicular mortality, and human persecution.
- Safe to approach?
- Venomous and defensive. Maintain a safe distance of at least 15 feet. If encountered, freeze and then back away slowly. Do not attempt to handle or kill the snake. In the event of a bite, remain calm to slow venom spread, immobilize the affected limb at or below heart level, and seek immediate emergency medical care. Do not apply ice, tourniquets, or attempt to suck out the venom.
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.
Photo: Brandon Bourassa, CC-BY, via iNaturalist
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