A medium-sized garter snake. Highly variable in coloration across range.

§ Quick facts

SizeLength 60–110 cm
Weight150–400 g
LifespanWild 8–14 years
OrderSquamata
FamilyColubridae

§ Encyclopedia

Garter snake is the common name for small to medium-sized snakes belonging to the genus Thamnophis in the family Colubridae. They are native to North and Central America, ranging from central Canada in the north to Costa Rica in the south.

Source: Wikipedia — Garter snake Licensed under CC BY-SA 4.0

§ Identification

Field marks. Slender brown to gray-olive snake with three yellow stripes (one dorsal, two lateral); some populations strongly patterned.

Similar species. Other Thamnophis species (multiple US species).

Voice. Hisses; releases musk.

§ Diet & behavior

Diet. Frogs, small fish, small mammals, lizards.

Behavior. Common western garter snake. Highly variable across range.

§ Range

Western North America

§ Habitat

Diverse habitats

§ Threats

Habitat loss.

§ Conservation status

According to the IUCN Red List, the western garter snake is currently classified as Least Concern.

§ What helps

Don't kill snakes.

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§ Further reading

§ Sources cited

  • Davidson College Department of Biology
  • IUCN Red List 2007