Mexican West-Coast Rattlesnake
Federal and State Protections
Countries of Occurrence
States or Providence
Sonora, Sinaloa, Nayarit, Jalisco, Colima, Michoacan, Oaxaca
31.7in (80.5cm) - 80.3in (204cm)
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.