The San Francisco garter snake, Thamnophis sirtalis tetrataenia, is renowned for its striking coloration of turquoise and red-orange stripes. It inhabits the wetlands of California, relying on dense vegetation for cover. This semi-aquatic snake preys on amphibians, playing a crucial role in maintaining ecological balance.

Thamnophis sirtalis tetrataenia, commonly known as the San Francisco garter snake, is native to the western United States, specifically in the San Francisco Peninsula in California.

This species typically inhabits areas with a mild, Mediterranean climate characterized by wet, cool winters and dry, warm summers. It is often found in densely vegetated freshwater marshes, ponds, and slow-moving streams, which provide essential cover and breeding grounds.

The San Francisco garter snake occupies a unique ecological niche as a semi-aquatic predator. It primarily feeds on amphibians, particularly the Pacific tree frog and the California red-legged frog. This species relies on dense vegetation for protection from predators and for basking sites, which are crucial for thermoregulation.