Southern Pacific Rattlesnake
Crotalus helleri
A common rattlesnake of coastal and inland southern California, noted for its variable venom and dark diamond blotches.
- Venomous?
- Venomous
- Adult length
- 0.9-1.2 m (3-4 ft)
- Range
- Southern California, USA and northern Baja California, Mexico
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Overview
The Southern Pacific Rattlesnake is a medium-sized pit viper widespread throughout southern California and into northern Baja California, Mexico. It inhabits a broad range of environments from coastal scrub to chaparral and foothill woodlands.
This species is notable among rattlesnakes for populations exhibiting variable venom composition, with some individuals possessing a neurotoxic component in addition to typical hemotoxic effects.
How to identify it
- Background color olive, brown, or gray with dark brown to black diamond-shaped blotches down the back
- Blotches transition to bands near the tail
- Broad, triangular head distinct from the neck
- Heat-sensing pit between eye and nostril
- Vertically elliptical pupils
- Distinguished from the red diamond rattlesnake by darker, less reddish coloration
Habitat & range
Found in coastal sage scrub, chaparral, oak woodland, and foothill grasslands across southern California and extending into northern Baja California, Mexico, from sea level to moderate elevations.
Behavior, diet & reproduction
Active by day in cooler months and more nocturnal during hot summer periods. Feeds on small mammals, birds, and lizards through ambush predation. Viviparous, bearing live young in late summer. Rattles as a warning when disturbed but generally avoids confrontation.
Frequently asked questions
Is the Southern Pacific Rattlesnake's venom unusual?
Some populations exhibit a neurotoxic venom component in addition to the typical hemotoxic effects seen in most rattlesnakes.
Where does it live?
It is common throughout southern California and into northern Baja California, Mexico.
How can I identify it?
Look for dark diamond-shaped blotches on an olive to brown body, with the pattern becoming banded near the tail.
What habitats does it prefer?
It favors coastal scrub, chaparral, and oak woodland habitats.
Southern Pacific Rattlesnake guides
In-depth guides for identifying and understanding Southern Pacific Rattlesnake.
