Common Garter Snake
Thamnophis sirtalis
Natricidae, Order Squamata
Physical Description
Elongated body shape with a distinct head separated from the neck, keeled dorsal scales, and tapering tail; clearly a vertebrate animal rather than an arachnid, despite the user prompt requesting spider information for a provided snake image.
Size Estimate
Total length approximately 46 to 130 cm (18 to 51 inches), adult specimen.
Coloration & Markings
Dark brown to olive or black base coloration featuring three distinctive light-colored longitudinal stripes running down the back and sides.
Web Type
Does not apply; this is a snake species and does not construct webs.
Eye Arrangement
Two lateral eyes with round pupils typical of colubroid snakes.
Leg Characteristics
Does not apply; snakes are limbless reptiles.
Venom & Safety Information
Venom Information
Contains mild, modified saliva secretions that are non-toxic to humans and primarily used to subdue small prey.
Medical Significance
Harmless to humans; bites may cause minor local irritation but possess no medical significance.
Safety Recommendations
Observe from a safe distance and allow the snake to retreat peacefully; if handled, wash hands thoroughly to remove any defensive musk.
Habitat & Behavior
Habitat & Range
Widely distributed across North America in meadows, marshes, woodlands, and along the edges of bodies of water.
Behavior & Temperament
Active diurnal forager; generally docile when approached but may release musk, flatten its body, or strike defensively if cornered.
Diet & Prey
Carnivorous; feeds primarily on amphibians, earthworms, small fish, and occasionally mice or other small reptiles.
Seasonal Activity
Active from spring through autumn, retreating underground to brumate during the coldest winter months.
Description
Although submitted under a spider identification prompt, the image clearly depicts a Common Garter Snake, a familiar and harmless reptile frequently encountered in North American gardens and fields.
Key Features
Three distinct light longitudinal stripes running the length of a dark body, keeled scales, and a slender build.
Similar Species
Ribbon snakes (Thamnophis saurita), which are much more slender with longer tails and distinct facial markings.
Life Cycle
Viviparous, giving birth to live young rather than laying eggs, with litters often numbering between 10 and 40 offspring.
Ecological Importance
Acts as an important mid-level predator helping to regulate amphibian and insect populations while serving as prey for larger birds and mammals.
Conservation Status
Least Concern according to the IUCN Red List, with stable and widespread populations.
Interesting Facts
Garter snakes are semi-aquatic, excellent swimmers, and often gather in massive numbers to brumate communally during the winter months.
Photography Tips
Use natural daylight, keep a respectful distance to avoid startling the animal, and capture the entire length of the body to show the characteristic stripes.
Identified: 2026-10-02T18:46:28.180209