Snake myths, practical clues, and safer decisions.

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Published snake guide

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177 published

Western Diamond‑backed Rattlesnake

Crotalus atrox

Venomous

Crotalus atrox, commonly known as the Western Diamond‑backed Rattlesnake, is a large pit viper native to the southwestern United States and northern/central Mexico. It is a venomous ambush predator associated with arid and semi‑arid habitats. Bites can be medically significant; avoid close approaches and secure dwellings and yards to reduce encounters.

Western Foxsnake

Pantherophis ramspotti

No medically significant venom known

Pantherophis ramspotti (Western foxsnake) is a nonvenomous colubrid native to parts of central and western North America. It is a medium to large, primarily diurnal snake often found near agricultural edges, woodlands, wetlands, and human structures. It feeds on rodents, small birds, eggs, and occasionally amphibians and insects. When threatened it may vibrate its tail and emit musk; it may also flatten its head and body to appear larger.

Western Groundsnake

Sonora semiannulata

No medically significant venom known

Sonora semiannulata (Western groundsnake) is a small, secretive colubrid native to arid and semi-arid regions of western North America. Non-aggressive and primarily nocturnal or crepuscular, it feeds on small reptiles, amphibians, and invertebrates. Not considered to have medically significant venom to humans; bite effects are typically mild if they occur. Often found under rocks, logs, or debris; homeowners should avoid handling and exclude snakes from structures by sealing gaps and reducing cover near buildings.