Garter Snake Garter Snake Thamnophis spp. The position of the stripes distinguishes different, closely related species.
Most species have two small, white or yellow spots on top of their heads.
Females larger than males. Scales ridged, in 19 rows. Feeds on frogs , toads , salamanders, earthworms, insects, and sometimes mice. Mates in early spring and late summer. Often flattens body when alarmed, making pattern of stripes especially visible.