The Sharp-tailed Snake or Sharptail Snake (Contia tenuis) is a small, locally common colubrid snake that lives in the western United States. The snake averages from eight to twelve inches long as an adult. It is distinguished by its sharp tail spine, which is the protruding tip of the last tail vertebrae. The spine is not toxic and cannot injure humans. Rather, the tail is used to stabilize small prey, such as slugs, for consumption. The dorsal surface ranges in color from greyish-brown to brown to brick red, with bubble-gum pink and peachy-orange specimens occasionally found. The ventral surface is a striking series of black and white bars. The Sharp-tailed snake is distributed the states of Oregon, Washington, and California, as well as British Columbia, Canada.

Sharp-tailed snakes are shy, secretive creatures most often encountered under rocks and logs, and rarely to never found in the open. They are able to persist in urban areas where appropriate cover can be found. They are known to burrow into soft soil or cracks in the clay, and may be encountered while digging in the garden or removing concrete. When encountered, Sharp-tailed snakes may roll into a ball and remain still. They can be mistaken for worms to the casual observer. 4-16 eggs are laid in the summer, underground or in a burrow. Young are 3-4 inches long.

Recently, extensive studies on this reptile have shown definite differences that may prove to be a new species.Template:Citation needed The maximum length is 17-18 inches, with different scaling, as well as a longer tail. The species range extends from southern British Columbia to southern Sierra Nevada and to the central coast of California. The fragmented distribution of the snake in the northern part of its range suggests that populations in British Columbia are relics of a more extensive previous distribution.Template:Citation needed Seven sites are known in the province, all located on the Gulf Islands and in southeastern Vancouver Island. In 1996-97 the persistence of the snakes was confirmed at four of the seven sites, where they appeared to be confined to habitat patches of about 2 km in diameter.Template:Citation needed The secretive habits and seasonal activity pattern of the snakes make it difficult to assess their distribution and accurately estimate population densities.

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