Mexican West Coast Rattlesnake
Crotalus basiliscus
One of the largest rattlesnakes in Mexico, inhabiting tropical dry forest and thorn scrub along the Pacific coast.
- Venomous?
- Venomous
- Adult length
- 1.2-2.0 m (4-6.6 ft)
- Range
- Pacific coastal lowlands of western Mexico
Found a snake like this?
Identify any snake from a photo, free.
Overview
The Mexican West Coast Rattlesnake is among the largest rattlesnakes found in Mexico, ranging along the Pacific coastal plain and adjacent foothills from Sonora south to Oaxaca. Its large size and potent venom make it a species of medical significance in the region.
It occupies tropical dry forest and scrubland habitats, often in proximity to agricultural areas where rodent prey is abundant.
How to identify it
- Background color yellowish-brown, olive, or tan
- Large, dark diamond-shaped dorsal blotches with lighter borders
- Blotches become more banded toward the tail
- Broad triangular head, elliptical pupils, heat-sensing pits
- Large size compared to most other Mexican rattlesnakes
- Segmented rattle
Habitat & range
Inhabits tropical dry forest, thorn scrub, and coastal lowlands along Mexico's Pacific slope, from near sea level up into foothill terrain. Often found near agricultural fields and disturbed habitat where rodents are abundant.
Behavior, diet & reproduction
Primarily nocturnal, especially in hot lowland regions. Feeds on rodents, rabbits, and occasionally birds, taking advantage of its large size to subdue sizeable prey. Reproduces via live birth. Considered one of the more dangerous rattlesnakes in Mexico due to its size and venom yield.
Frequently asked questions
How large does the Mexican West Coast Rattlesnake get?
It is one of the largest rattlesnakes, with adults commonly reaching 1.2-2.0 m (4-6.6 ft).
Where is it found?
Along the Pacific coastal lowlands and foothills of western Mexico, from Sonora to Oaxaca.
What habitat does it prefer?
Tropical dry forest, thorn scrub, and areas near agricultural land.
What does it eat?
Primarily rodents and rabbits, along with occasional birds.
Mexican West Coast Rattlesnake guides
In-depth guides for identifying and understanding Mexican West Coast Rattlesnake.
