Mexican Wandering Garter Snake
Thamnophis errans
A wide-ranging highland garter snake of western Mexico, adaptable to a variety of montane stream and forest habitats.
- Venomous?
- Mildly venomous
- Adult length
- 0.5-0.9 m (1.6-3 ft)
- Range
- Western Mexico (Sierra Madre Occidental region)
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Overview
The Mexican wandering garter snake occupies a broad range of habitats across the mountains of western Mexico, from pine-oak forests to streamside meadows. Its scientific name reflects its relatively wide distribution compared to many localized highland garter snakes.
It is part of the diverse Thamnophis radiation found throughout Mexico's mountain systems, many of which show subtle regional variation in pattern and coloration.
How to identify it
- Olive to brownish dorsal color with moderately distinct longitudinal stripes
- Keeled scales
- Round pupils
- Moderately slender, adaptable body form
- Distinguished from close relatives mainly through range and fine scale characteristics
Habitat & range
Found across a range of montane habitats in western Mexico, including pine-oak forests, streams, and meadows at moderate to high elevation.
Behavior, diet & reproduction
Diurnal, foraging both in water and on land for amphibians, fish, and invertebrates. Mild venom used to subdue prey, harmless to humans. Live-bearing reproduction.
Frequently asked questions
Why is it called 'wandering'?
Its scientific name reflects its comparatively broad distribution across western Mexico's mountains.
What habitats does it use?
Pine-oak forests, streams, and meadows at moderate to high elevations.
Is it dangerous to people?
No, its venom is mild and intended for small prey, not a threat to humans.
What does it eat?
Amphibians, fish, and invertebrates.
Mexican Wandering Garter Snake guides
In-depth guides for identifying and understanding Mexican Wandering Garter Snake.
