Highland Garter Snake
Thamnophis scaliger
A cold-tolerant garter snake found at high elevations in central Mexico's mountain grasslands and pine forests.
- Venomous?
- Mildly venomous
- Adult length
- 0.4-0.7 m (16-28 in)
- Range
- High-elevation regions of central Mexico
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Overview
The highland garter snake occupies some of the highest elevations of any Thamnophis species in Mexico, ranging through cool montane grasslands, pine-oak forests, and rocky slopes. Its adaptation to cold, high-altitude environments distinguishes it ecologically from lowland relatives.
It is often found far from permanent water compared to many garter snakes, reflecting a more terrestrial lifestyle in its mountain habitat.
How to identify it
- Grayish to olive-brown dorsal coloring with faint or moderately distinct stripes
- Keeled scales
- Round pupils
- Compact, moderately stout body suited to cooler climates
- Distinguished from lowland Thamnophis by high-elevation range and more terrestrial habits
Habitat & range
Found in high-elevation grasslands, pine-oak forests, and rocky slopes of central Mexico's mountains, often well above 2,500 meters.
Behavior, diet & reproduction
Diurnal, active during warmer daytime hours to cope with cold montane temperatures. Feeds on small vertebrates and invertebrates found on land as well as near water sources. Mild venom used for prey subjugation, harmless to people. Live-bearing.
Frequently asked questions
What elevation does this snake live at?
It is found at high elevations, often above 2,500 meters, in central Mexico's mountains.
Is it aquatic like other garter snakes?
It is more terrestrial than many garter snakes, foraging on land as well as near water.
Is it dangerous to humans?
No, its mild venom only affects small prey and poses no risk to people.
What habitat types does it use?
Montane grasslands, pine-oak forests, and rocky slopes.
Highland Garter Snake guides
In-depth guides for identifying and understanding Highland Garter Snake.
