Black-necked Garter Snake

Thamnophis cyrtopsis

The black-necked garter snake (Thamnophis cyrtopsis) is a striped, live-bearing snake of the southwestern United States and Mexico, often found near streams, springs, washes, and rocky riparian edges. It usually shows a pale mid-dorsal stripe, side stripes, checkering, and dark markings on the neck that give the species its common name. Like many garter snakes, it is quick, alert, and tied to moist places where fish, amphibians, earthworms, and small invertebrates are available.

Keeping this species requires attention to both reptile husbandry and local collection laws. Captive setups need tight lids, clean water, dry hides, modest basking warmth, and frequent sanitation because aquatic prey can foul enclosures quickly. Diets should avoid dependence on unsafe feeder fish and can include earthworms, pieces of fish from suitable sources, and other balanced prey items. For wild populations, streamside cover, clean water, and protection of seasonal wetlands are more important than direct human handling.