San Francisco garter snake (Thamnophis sirtalis tetrataenia) Known for its bright blue or greenish-blue belly, red and black stripes, and the well-known red head, San Francisco garter snake is one ...

DESCRIPTION: The San Francisco garter snake is a slender, three-foot-long snake with an orange head, a greenish-yellow back bordered by red and black stripes, and a bright greenish-blue or turquoise ...