A small nocturnal snake.

Native status: Native to western US into Mexico

§ Quick facts

SizeLength 40–80 cm
Weight100–250 g
LifespanWild 6–10 years
OrderSquamata
FamilyColubridae

§ Encyclopedia

Hypsiglena torquata, the Sinaloan night snake, is a species of rear-fanged colubrid. It is endemic western Mexico. It is characterized by dark brown systematic blotches down its back and sides, a bar behind each eye, vertical pupils, and neck adornment. It is active in the twilight and at night. It is not dangerous to humans.

Source: Wikipedia — Hypsiglena torquata Licensed under CC BY-SA 4.0

§ Identification

Field marks. Slender snake with brown-tan background; small dark dorsal markings; vertical pupils.

Similar species. Other Hypsiglena species. Patch-nosed snake (different head shape).

Voice. Hisses.

§ Diet & behavior

Diet. Small lizards, frogs, small snakes.

Behavior. Mildly venomous nocturnal snake of arid southwestern habitats. Venom subdues prey; harmless to humans.

§ Range

Western US

§ Habitat

Diverse habitats

§ Threats

Habitat loss.

§ Conservation status

According to the IUCN Red List, the nightsnake is currently classified as Least Concern.

§ What helps

Don't kill snakes.

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§ Further reading

§ Sources cited

  • Arizona Game and Fish
  • Davidson College Department of Biology
  • IUCN Red List 2007