Cope's Garter Snake
Thamnophis copei
A highland garter snake from the Valley of Mexico, named after the prolific 19th-century naturalist Edward Drinker Cope.
- Venomous?
- Mildly venomous
- Adult length
- 0.4-0.7 m (16-28 in)
- Range
- Valley of Mexico highlands
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Overview
Cope's garter snake inhabits lakes, marshes, and streams in the high valleys of central Mexico, an area heavily affected by urbanization around Mexico City. It is named for Edward Drinker Cope, one of the most prolific American naturalists of the 19th century, who described numerous North American reptile and amphibian species.
Like other garter snakes of the region, it faces pressure from wetland loss and pollution in its historically water-rich highland habitat.
How to identify it
- Olive to grayish dorsal coloration with faint to moderate striping
- Keeled scales
- Round pupils
- Slender body typical of aquatic garter snakes
- Distinguished from related highland species mainly by range and subtle scale differences
Habitat & range
Found in lakes, marshes, and streams within high-elevation valleys of central Mexico, including areas historically part of the Valley of Mexico wetland system.
Behavior, diet & reproduction
Diurnal and aquatic, foraging in water for fish, tadpoles, and amphibians. Mild venom used for prey capture, not harmful to humans. Bears live young.
Frequently asked questions
Who is Cope's garter snake named after?
It is named for Edward Drinker Cope, a major 19th-century American naturalist.
Where is it found?
In high-elevation lakes, marshes, and streams of central Mexico's Valley of Mexico region.
Is it venomous to humans?
No, its mild venom only affects small prey.
Why might this species be threatened?
Because its highland wetland habitat has been heavily impacted by urbanization near Mexico City.
Cope's Garter Snake guides
In-depth guides for identifying and understanding Cope's Garter Snake.
