Black Garter Snake
Thamnophis melanogaster
A dark, aquatic garter snake native to the highland lakes and wetlands of central Mexico.
- Venomous?
- Non-venomous
- Adult length
- 0.4-0.7 m (1.3-2.3 ft)
- Range
- Central Mexico
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Overview
The Black Garter Snake is a semi-aquatic colubrid found in the highland wetlands of Mexico's central plateau. Its dark, often nearly black coloration helps it blend with murky water and vegetation.
Populations have declined due to habitat loss and pollution of the lakes and marshes it depends on.
How to identify it
- Dark brown to black dorsal coloration, sometimes with faint stripes
- Keeled scales typical of garter snakes
- Round pupils
- Slender build with a moderately long tail
- Distinguished from other garter snakes by its predominantly dark, unstriped appearance
Habitat & range
Inhabits lakes, marshes, and slow streams in the central Mexican highlands, often at moderate to high elevations.
Behavior, diet & reproduction
Diurnal and highly aquatic, foraging in water for fish and amphibians. Gives birth to live young. Generally docile when encountered.
Frequently asked questions
Is the Black Garter Snake venomous?
No, it is non-venomous and harmless to humans.
What does it eat?
It feeds mainly on fish and amphibians found in its wetland habitat.
Where does it live?
It is native to lakes and marshes of the central Mexican plateau.
Is this species threatened?
Yes, many populations have declined due to habitat degradation and pollution.
Black Garter Snake guides
In-depth guides for identifying and understanding Black Garter Snake.
