It is a small, reddish snake with striking black and white cross-lines down the underside. It is typically around 30 cm. long. There is a sharp spine at the end of the tail, which gives the snake its name. It seems to remain in a small home range and may have adapted to suburban habitats like backyards. It feeds on slugs.
This is a secretive, nocturnal snake and hard to see. We have seen it in our backyard in the East Bay Tri-valley area and have heard of other similar sightings. Our sightings have always been at night or when some object was picked up and the snake was discovered lying beneath it.