San Francisco garter snake

The San Francisco garter snake (Thamnophis sirtalis tetrataenia) is a slender multi-colored colubrid snake. Designated as an endangered species since the year 1967, it resides only in San Mateo County, California, and the extreme northern part of coastal Santa Cruz County, California. There are only 1,000 to 2,000 of the subspecies T. s. tetrataenia remaining.citation needed] This garter snake prefers wet and marshy areas and is elusive to see or capture. It is a subspecies of the common garter snake (Thamnophis sirtalis), a species found across the United States and into southern Canada.