Eric Centenero Alcala
Chihuahua Ridgenosed Rattlesnake
Crotalus willardi silus
Federal and State Protections
Federally Protected (MX)
Countries of Occurrence
15in (38cm) - 19.6in (50cm)
States or Providence
Sonora (MX), Chihuahua (MX), New Mexico (US)
The Chihuahua Ridgenosed Rattlesnake is a small species of rattlesnake found in the northern parts of the Sierra Madre Occidental mountains in Mexico and a small region of the Animas Mountains in the US. It has the largest range of any C. willardi subspecies. They favor temperate pine-oak forests with streams or creek-beds, and are most active during the rainy season. This species is found at elevations of 5500 to 8000ft (1676 -2438m) above sea level.
A generalist predator, this species targets a wide variety of prey, including lizards, rodents and even centipedes.