Snake myths, practical clues, and safer decisions.

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Published snake guide

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177 published

Checkered Garter Snake

Thamnophis marcianus

No medically significant venom known

Medium-sized natricine snake of open, often rocky or arid habitats; semi-aquatic near water in parts of range. Diurnal to crepuscular, feeds mainly on amphibians, fish, and small vertebrates. Found in southwestern United States, Mexico, and extreme southern Canada (if applicable records). Not considered dangerously venomous to humans; mild oral secretions may produce localized irritation in rare cases—treat as potentially venomous for handling and medical concerns.

Chihuahuan Black-headed Snake

Tantilla wilcoxi

No medically significant venom known

Tantilla wilcoxi (Chihuahuan black-headed snake) is a small, secretive colubrid found in arid and semi-arid regions of the U.S., Mexico, and rarely Canada. Mostly nocturnal or crepuscular, it feeds on small invertebrates and is non-aggressive. Not known to have medically significant venom to humans; bites are rare and typically produce minimal effects. Avoid handling wild snakes; contact professionals for removal if needed.

Chihuahuan Hook-nosed Snake

Gyalopion canum

No medically significant venom known

Small, secretive, mildly rear-fanged colubrid of arid and semi-arid regions in the southwestern United States, northern Mexico, and extreme southern California; nocturnal and primarily insectivorous/arthropod-eating. Rarely encountered; not known to cause medically significant envenomation to humans. Homeowners should avoid handling and can reduce encounters by removing debris and rodent attractants.