Eastern Garter Snake
Thamnophis sirtalis • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Thamnophis, Species: T. sirtalis
North America, widely distributed across eastern and central United States and parts of southern Canada, ranging from Maine down to Florida and west to the Great Plains.
Look up Eastern 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. Populations are generally robust, though local declines occur due to habitat fragmentation, road mortality, and intentional persecution.
Physical Description
Slender body with a dark brown to olive dorsal background, pale yellowish longitudinal striping along the back and sides, checkered pattern visible between stripes, and a lighter cream-colored ventral side. Head is distinct from the neck with round pupils and keeled scales giving a textured appearance.
Size & Dimensions
Specimen pictured appears to be a juvenile approximately 30 to 45 cm in total length. Adults typically range from 46 to 130 cm with an average around 55 to 90 cm.
Habitat
Found in a diverse array of habitats including grasslands, woodlands, marshes, fields, and suburban backyards, usually near a permanent or temporary water source. Elevation ranges from sea level to over 2,000 meters.
Diet & Feeding
Generalist carnivore feeding primarily on amphibians (frogs, toads, salamanders), earthworms, small fish, and occasionally mice or other small reptiles. Uses an active foraging strategy to locate prey by scent and captures them with a direct strike.
Reproduction
Viviparous (gives birth to live young). Mating occurs primarily in spring shortly after emerging from hibernation, followed by litters ranging from 10 to 40+ young born in late summer.
Look-alikes
Frequently confused with other garter snake species (such as the Plains Garter Snake or Western Terrestrial Garter Snake) and ribbon snakes (Thamnophis saurita). Ribbon snakes can be distinguished by their extremely slender build, longer tails, and white spot in front of the eye.
Conservation Status
IUCN Red List status is Least Concern. Populations are generally robust, though local declines occur due to habitat fragmentation, road mortality, and intentional persecution.
Cultural Significance
Commonly encountered in suburban environments, playing an important role in controlling garden pests like slugs and insects. Frequently kept as educational pets due to adaptability.
Notable Features
Exhibits robust adaptability to human-altered landscapes, and possesses a specialized musk released from cloacal glands when threatened as a defensive mechanism.