Western Terrestrial Garter Snake
Thamnophis elegans • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Thamnophis, Species: T. elegans
Western North America, ranging from southwestern Canada through the western United States down into northern Mexico, inhabiting regions from coastal areas to high mountain ranges.
Look up Western Terrestrial Garter Snake in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Thamnophis, Species: T. elegans
Conservation
IUCN Red List status is Least Concern, as it has a wide distribution, presumed large population, and broad ecological tolerance, though local populations may face habitat loss and fragmentation.
Physical Description
Dark brown to blackish dorsal background with a distinct, bright yellowish-white vertebral stripe running down the back, accompanied by alternating dark spots and reddish-orange markings along the flanks. The head is relatively distinct from the neck with round pupils and keeled dorsal scales.
Size & Dimensions
Estimated specimen length is approximately 45 to 60 cm (juvenile to subadult). Typical adult size ranges from 45 to 105 cm in total length.
Habitat
Found in a wide variety of habitats including meadows, forests, shrublands, and particularly near permanent or temporary water sources such as streams, lakes, ponds, and marshy areas, ranging from sea level up to high elevations.
Diet & Feeding
Diet is highly diverse and opportunistic, consisting of amphibians, fish, small mammals, birds, reptiles, and earthworms. Employs an active foraging strategy, locating prey primarily by scent.
Reproduction
Viviparous (giving live birth), typically producing litters ranging from 3 to 25 or more young, usually mating in the spring shortly after emerging from brumation.
Look-alikes
Frequently confused with other garter snake species within the genus Thamnophis, such as the Common Garter Snake (Thamnophis sirtalis) and the Northwestern Garter Snake (Thamnophis ordinoides). Distinguished by scale row counts, exact stripe configurations, and regional variations in coloration.
Conservation Status
IUCN Red List status is Least Concern, as it has a wide distribution, presumed large population, and broad ecological tolerance, though local populations may face habitat loss and fragmentation.
Cultural Significance
Serves an important ecological role as both predator and prey within aquatic and riparian food webs, helping control amphibian and invertebrate populations.
Notable Features
Exhibits significant ecological and morphological plasticity across its vast geographic range, with different subspecies adapted to strictly aquatic habits or entirely terrestrial foraging.