All garter snakes have keeled scales, which means they have a ridge down the center.
There are many color variations of garter snakes, but they all have three light stripes that run the length of their body.
Common Garter Snake - Thamnophis sirtalis
Garter snakes have large heads with small eyes.
Head shot of a garter snake flicking its tongue
The garter snake has a red tongue with a black tip.
Common garter snake displaying its fangs
Garter snake venom is harmless to humans but it effectively subdues its prey.