The San Francisco garter snake has been dubbed “the most beautiful serpent in North America,” and it's arguably one of the most endangered species, too. All known populations of this fantastically ...

There may be 1,000 to 2,000 individual San Francisco garter snakes remaining in the wild today; the snake is now so imperiled that it is difficult to get enough data to estimate the population with ...

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 ...