Snake Identifier
Colubrids

Tamaulipan Montane Garter Snake

Thamnophis mendax

A rare, range-restricted garter snake known only from a small mountainous area of Tamaulipas, Mexico.

Venomous?
Mildly venomous
Adult length
0.4-0.6 m (16-24 in)
Range
Sierra Madre Oriental, Tamaulipas, Mexico

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Overview

The Tamaulipan montane garter snake is a poorly studied species known from a limited area of the Sierra Madre Oriental in the Mexican state of Tamaulipas. Its restricted distribution and specialized montane habitat make it one of the rarer garter snake species.

Few detailed studies exist on its ecology, and its conservation status is difficult to assess due to limited data.

How to identify it

  • Slender body with faint striping typical of Thamnophis
  • Olive to brownish dorsal coloration
  • Keeled scales
  • Round pupils
  • Best distinguished from related species by its very restricted range in Tamaulipas

Habitat & range

Restricted to montane forest and stream habitats within the Sierra Madre Oriental of Tamaulipas, Mexico, at moderate to high elevations.

Behavior, diet & reproduction

Presumed diurnal and semi-aquatic, foraging near streams for amphibians and invertebrates, consistent with related Thamnophis species. Mild venom used on prey, not a concern for humans. Believed to be live-bearing like other garter snakes.

Frequently asked questions

Where is this species found?

It is known only from a limited mountainous area of Tamaulipas, Mexico, in the Sierra Madre Oriental.

Is much known about its biology?

No, it is poorly studied due to its restricted range and remote habitat.

Is it venomous to humans?

It has only mild venom used for subduing prey, harmless to people.

What kind of habitat does it use?

Montane forest and stream habitats at moderate to high elevation.