Eastern Garter Snake
Thamnophis sirtalis sirtalis • Order: Squamata, Suborder: Serpentes, Family: Colubridae, Subfamily: Natricinae, Genus: Thamnophis, Species: Thamnophis sirtalis
Venomous Status
Harmless / Non-venomous (though specialized saliva has mild properties effective on small prey).
Danger Level
Harmless; poses no threat to humans or pets. Generally chooses flight over fight.
Geographic Range
Commonly found throughout North America, specifically the eastern half of the United States and Canada, ranging from the Atlantic coast west to the Great Plains.
Conservation Status
Least Concern (IUCN). Population is stable, though local declines can occur due to pesticide use and habitat loss.
Physical Description
Characterized by three longitudinal yellow, cream, or greenish stripes on a dark background (black, brown, or olive). The head is slightly wider than the neck, with large eyes and round pupils. Scales are distinctly keeled.
Size & Dimensions
The specimen appears to be an adult approximately 18-24 inches long. The species typically ranges from 18 to 26 inches, with a maximum recorded length of 49 inches.
Habitat
Highly adaptable; prefers moist environments such as meadows, marshes, woodlands, and hillsides, often near water sources. Frequently encountered in suburban gardens and parks.
Behavior & Temperament
Primarily diurnal. Generally docile but can be flighty. If handled, it may secrete a foul-smelling musk from its cloaca or strike defensively as a last resort.
Diet & Feeding
Generalist carnivore; feeds on earthworms, amphibians (frogs, toads, salamanders), fish, and occasionally small rodents or birds. They are active hunters that do not constrict.
Reproduction
Ovoviviparous (notable for giving birth to live young). Litters typically range from 10 to 40 young, born in late summer or early autumn.
Venom Profile
Venom Type
Non-venomous - no medically significant venom. Saliva may cause mild localized irritation or swelling in rare cases of hypersensitivity.
AI-generated — see a qualified source if acting on this. For any snakebite, call emergency services immediately.
Look-alikes
Commonly confused with Ribbon Snakes (Thamnophis saurita), which are much more slender with longer tails and lack the dark markings on the labial scales.
Conservation Status
Least Concern (IUCN). Population is stable, though local declines can occur due to pesticide use and habitat loss.
Cultural Significance
One of the most well-known and recognized snakes in North America. They play a vital role in controlling pest populations and are frequently used in educational programs to teach about reptiles.
Notable Features
Highly cold-tolerant; they are often one of the first snakes to emerge in spring. They possess a specialized immunity to the toxins found in the skin of toads and newts.