San Francisco Gartersnake (Thamnophis sirtalis tetrataenia) - San Mateo County, CA
The San Francisco Gartersnake is an endangered subspecies of the Common Gartersnake (T.sirtalis) found in the San Francisco Bay Area.
Habitat loss, commercial collecting (although it is illegal to posses and sell this subspecies in the United States, they are available outside the country), as well the introduction of non-native, invasive bullfrogs (which prey on young snakes, as well as consume native species that provide prey for these snakes) are all contributing factors to the decline of San Francisco Gartersnakes.
San Francisco Gartersnakes are only found within San Mateo County, California (with some reports in extreme northern Santa Cruz County, along the coast).
As these snakes are a federally protected species, it is against the law to handle, touch, or manipulate these snakes.