The Texas Garter Snake (Thamnophis sirtalis annectens) is a subspecies of the common garter snake (T. sirtalis) endemic to the United States.
Completely harmless, and members of the colubrid family, they are easily mistaken for other garter snake species. They have a greenish-black back with a distinctive bright orange or red stripe down the center and yellowish stripes on either side of the body.