Common Garter Snake
Thamnophis sirtalis • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Thamnophis, Species: T. sirtalis
North America, spanning widely across the United States, Canada, and extending down into parts of Mexico, inhabiting varied biomes from sub-arctic regions to subtropical wetlands.
Look up Common Garter Snake in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Thamnophis, Species: T. sirtalis
Conservation
IUCN Red List status is Least Concern, as they remain widespread and abundant throughout their range, though local populations face habitat fragmentation.
Physical Description
Displays a dark dorsal background with characteristic longitudinal yellowish stripes running down the body. The scales are prominently keeled, giving a textured appearance. The head is distinct from the neck, with dark vertical barring visible on the labial scales and round pupils.
Size & Dimensions
The visible specimen appears to be an adult, roughly 60 to 90 cm in length. Typical adults range from 46 to 130 cm depending on subspecies and sex.
Habitat
Highly adaptable, found in meadows, marshes, woodlands, and along the edges of streams, ponds, and ditches, often utilizing thick ground cover or leaf litter for concealment.
Diet & Feeding
An opportunistic generalist predator consuming amphibians, earthworms, small fish, rodents, and occasionally birds, utilizing active foraging and seizing prey with quick strikes.
Reproduction
Viviparous, giving birth to live young rather than laying eggs. Mating typically occurs in spring shortly after emerging from hibernation, resulting in litters that can range from 10 to upwards of 40 neonates.
Look-alikes
Frequently confused with other ribbon snakes or garter snake species within the genus Thamnophis, as well as certain species of lined snakes and racer juveniles, distinguished primarily by scale counts and precise stripe positioning.
Conservation Status
IUCN Red List status is Least Concern, as they remain widespread and abundant throughout their range, though local populations face habitat fragmentation.
Cultural Significance
Commonly encountered in suburban environments, playing a valuable ecological role in controlling amphibian and invertebrate populations and frequently featured in educational nature programs.
Notable Features
Noted for communal brumation sites where hundreds of individuals may gather to overwinter, and an impressive resistance to certain toxins found in their preferred amphibian prey.