Photo credit:

Rob Schell

Common name

Mexican West-Coast Rattlesnake

Scientific name

Crotalus basiliscus

Conservation Status

Least Concern

Federal and State Protections

Countries of Occurrence


States or Providence 

Sonora, Sinaloa, Nayarit, Jalisco, Colima, Michoacan, Oaxaca


Adult size

31.7in (80.5cm) - 80.3in (204cm)

Species Description

The Mexican West-Coast Rattlesnake is a large-bodied snake found between the Gulf of California and the central cordillera. This species typically inhabits dry, lowland thornscrub forests, tropical deciduous forests, and occasionally mixed pine-oak highland forests.
Females of this species give live birth to upwards of 60 young, although the reported average is 33 babies per litter. Infant and juvenile Mexican West-Coast Rattlesnakes have also been observed climbing into bushes as a means of thermoregulation (controlling their body temperature).

Hybridization with the closely related species, Crotalus molossus, is likely in areas of Sonora where the two species overlap in range.

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