Reptiles
Black-Necked Garter Snake
Thamnophis cyrtopsis · also called black-necked garter snakes
Along a rocky canyon stream, a black-necked garter snake slips into a shallow pool without hesitation, diving after a fish in water most other garter snakes sharing this same desert region would never bother entering so readily.
Overview
The black-necked garter snake, Thamnophis cyrtopsis, is a non-venomous snake native to rocky canyon and stream habitat across the southwestern United States and Mexico. Its distinctive neck markings and unusually strong tie to rocky watercourses set it apart from garter snake relatives with more generalised habitat preferences.
A garter snake married to its canyon stream
While many garter snakes range fairly broadly across varied wetland habitat, the black-necked garter snake stays close to a specific kind of rocky canyon stream, a habitat loyalty that shapes both its diet and its genuinely strong swimming ability.
Status
Least Concern — widespread and stable across suitable rocky canyon stream habitat throughout the southwestern United States and Mexico.
Black-Necked Garter Snake: common questions
Why is it called the black-necked garter snake?
A black-necked garter snake carries a pair of prominent dark blotches on the neck just behind the head, a distinctive marking that gave the species its common name and helps distinguish it from other garter snake species that lack this specific neck pattern.
Why does the black-necked garter snake stay so close to canyon streams?
The black-necked garter snake is closely associated with rocky canyon streams and rivers, relying heavily on the amphibians and fish found in these specific habitats for food, a dietary and habitat specialisation that ties the species more tightly to rocky watercourses than several of its garter snake relatives.
Is the black-necked garter snake a good swimmer?
Yes, a black-necked garter snake is a capable swimmer and diver, often entering water directly to hunt fish and amphibians or to escape a perceived threat, an ability well suited to its close association with rocky stream and canyon habitat.
Where does the black-necked garter snake live?
The black-necked garter snake is native to rocky canyon and stream habitat across the southwestern United States and Mexico, generally favouring rugged terrain with reliable water sources.