Reptiles
Red Diamond Rattlesnake
Crotalus ruber · also called red diamond rattlesnakes
A hiker in the coastal chaparral of southern California nearly steps beside a red diamond rattlesnake before noticing it at all, the snake simply holding still rather than rattling or striking, true to its reputation as one of the calmer rattlesnakes around.
Overview
The red diamond rattlesnake, Crotalus ruber, is a large, distinctively coloured rattlesnake native to coastal sage scrub, chaparral, and desert habitat across southern California and the Baja California peninsula. Its notably calm temperament, striking reddish-pink colouration, and ongoing pressure from habitat loss and illegal collection make it one of the more visually memorable yet genuinely at-risk rattlesnakes in the American Southwest.
A rattlesnake that would rather be left alone
Where many rattlesnakes respond to disturbance with an immediate warning rattle, the red diamond rattlesnake often simply stays still, a calmer default that has earned it a reputation as one of the more even-tempered members of its family.
Status
Near Threatened — declining locally due to habitat loss from development, road mortality, and illegal collection for the pet trade.
Red Diamond Rattlesnake: common questions
Is the red diamond rattlesnake dangerous to encounter?
It carries venom capable of causing a serious medical emergency like other rattlesnakes, but it has a reputation as one of the more mild-tempered members of its group, often reluctant to rattle, coil, or strike even when closely approached, making unprovoked encounters less likely to end badly than with some other rattlesnake species.
How can you identify a red diamond rattlesnake?
Look for a reddish-pink to brick-red body colour marked with a darker diamond-shaped pattern running down the back, a distinctive combination that sets this species apart from other rattlesnakes sharing its coastal southern California and Baja California range.
Why has the red diamond rattlesnake declined in parts of its range?
Habitat loss from coastal and desert development, road mortality, and illegal collection for the pet trade have all contributed to localized population declines, particularly in the more heavily developed parts of southern California, though the species remains more secure across less developed stretches of Baja California.
How big does a red diamond rattlesnake get?
This species grows to a substantial size, ranking among the larger rattlesnake species found within its coastal southern California and Baja California range.