Snake Identifier
Mexican Hognose Snake (Heterodon kennerlyi)
Heterodon kennerlyi 25041000 by Alex Abair, via Wikimedia Commons, licensed under CC BY 4.0
Colubrids

Mexican Hognose Snake

Heterodon kennerlyi

A stocky, upturned-snouted snake famous for its dramatic defensive bluff display, including hissing, hood-flattening, and death-feigning.

Venomous?
Mildly venomous
Adult length
40-60 cm (16-24 in)
Range
Southwestern United States (southern Arizona, New Mexico, Texas) and northern Mexico

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Overview

The Mexican Hognose Snake is a stocky, distinctively snouted colubrid found in arid grasslands and scrub of the southwestern United States and northern Mexico. It was formerly considered part of the wider Western Hognose Snake complex before being recognized as a separate species restricted to the Chihuahuan Desert region.

This species is best known for its theatrical defensive behavior: when threatened, it may flatten its neck like a cobra, hiss loudly, and if that fails, roll over and feign death with its mouth agape. Despite this dramatic bluffing, it is only mildly venomous and poses no real danger to people.

How to identify it

  • Stocky, moderately short body with keeled scales
  • Sandy tan, gray, or brown dorsal coloration with rows of darker brown or olive blotches
  • Sharply upturned, shovel-like snout used for digging
  • Round pupils; broad head distinct from the neck
  • Distinguished from other hognose snakes by range (Chihuahuan Desert) and subtle scale and pattern differences

Habitat & range

Inhabits arid grasslands, desert scrub, and sandy or gravelly soils of the Chihuahuan Desert region across southern Arizona, New Mexico, west Texas, and northern Mexico. Favors areas with loose soil suitable for burrowing.

Behavior, diet & reproduction

Primarily diurnal, most active in the morning and late afternoon. Known for elaborate defensive displays including hissing, hood-spreading, and death-feigning when threatened, though actual bites are extremely rare. Feeds mainly on toads and other amphibians, which it digs from the ground using its upturned snout. Lays eggs in early summer.

Frequently asked questions

Is the Mexican Hognose Snake dangerous?

No, it is only mildly venomous and poses no real threat to humans despite its dramatic defensive displays.

Why does it play dead?

It is a defensive bluff behavior to discourage predators, in which the snake rolls over and remains motionless with its mouth open.

What does it eat?

Primarily toads and other amphibians, dug from the soil with its upturned snout.

How is it different from the Western Hognose Snake?

It is a separate species restricted to the Chihuahuan Desert region, distinguished by range and subtle physical differences.