Mexican Dusky Rattlesnake
Crotalus triseriatus
A small, high-elevation rattlesnake of Mexico's central highland forests, notable for its diminutive size and dark, muted coloration.
- Venomous?
- Venomous
- Adult length
- 0.4-0.6 m (1.3-2 ft)
- Range
- Highland pine-oak forests of central Mexico
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Overview
The Mexican Dusky Rattlesnake is a small species inhabiting the cool, high-elevation pine-oak forests of Mexico's central volcanic belt. It is among the smallest rattlesnake species and is well adapted to montane forest conditions.
Its subdued, dusky coloration and small size allow it to remain well camouflaged among forest leaf litter and rocky ground cover.
How to identify it
- Small overall size, among the smallest rattlesnake species
- Dark gray, brown, or dusky olive background coloration
- Rows of small, dark blotches running down the back, sometimes forming three distinct series
- Broad triangular head, elliptical pupils, heat-sensing pits
- Small rattle
- Distinguished from other Mexican rattlesnakes by small size and high-elevation forest habitat
Habitat & range
Found in pine-oak and fir forests of the central Mexican highlands, often at elevations above 2,000 m (6,500 ft). Typically encountered among leaf litter, fallen logs, and rocky forest floor habitat.
Behavior, diet & reproduction
Primarily diurnal due to the cooler temperatures of its high-elevation habitat. Feeds on small rodents and lizards. Reproduces via live birth. Generally a secretive, slow-moving species that relies on camouflage within forest litter.
Frequently asked questions
How small is the Mexican Dusky Rattlesnake?
It is among the smallest rattlesnake species, typically reaching only 0.4-0.6 m (1.3-2 ft) in length.
Where does it live?
In cool, high-elevation pine-oak forests of Mexico's central volcanic highlands.
Is it active during the day?
Yes, its high-elevation habitat's cooler temperatures make it more diurnal than many lowland rattlesnakes.
What does it eat?
Primarily small rodents and lizards found in forest leaf litter.
Mexican Dusky Rattlesnake guides
In-depth guides for identifying and understanding Mexican Dusky Rattlesnake.
