Considered an endangered species since 1967, the San Francisco garter snake lives only in the northern part of coastal Santa Cruz  County and San Mateo County, CA. Preferring wet, marshy habitats, it is elusive the capture or even see.  Its elusiveness strongly hinders the ability to obtain reliable population statistics or distribution information. It is reported that much of the remaining suitable habitat for the snake is private property that has not been surveyed for its presence. The San Francisco garter snake principally feeds on California red-legged frogs, which only reside near fresh water.