Mexican Black-Headed Snake
Tantilla atriceps
A tiny, secretive snake with a glossy tan body and a distinct black cap over the head and neck.
- Venomous?
- Mildly venomous
- Adult length
- 15-25 cm (6-10 in)
- Range
- Southern Texas and northeastern Mexico
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Overview
The Mexican Black-Headed Snake is one of several small Tantilla species found in the southern United States and Mexico, distinguished mainly by subtle head pattern and range. It spends most of its life hidden underground or under surface cover.
Despite possessing mild rear-fang venom, it is harmless to people and rarely encountered due to its secretive, fossorial habits.
How to identify it
- Small, slender body, uniform tan to reddish-brown above
- Solid black cap covering the head and extending onto the neck
- Pale, unmarked belly
- Smooth scales and a small, rounded head barely wider than the neck
- Distinguished from similar Tantilla species mainly by range and minor head-pattern details
Habitat & range
Found in a variety of semi-arid habitats including brushland, grassland, and open woodland with loose soil or leaf litter, in southern Texas and northeastern Mexico.
Behavior, diet & reproduction
Fossorial and secretive, spending most of its time under rocks, logs, or loose soil. Feeds mainly on centipedes and insect larvae, subdued with mild venom. Lays a small clutch of eggs.
Frequently asked questions
Is the Mexican Black-Headed Snake dangerous?
No, its mild venom is used to subdue small invertebrate prey and it poses no real threat to humans.
Why is it rarely seen?
It is a small, secretive, burrowing snake that spends most of its time under cover or underground.
How can I identify it?
Look for a small tan snake with a solid black cap over the head and neck.
Mexican Black-Headed Snake guides
In-depth guides for identifying and understanding Mexican Black-Headed Snake.
