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The Colubridae (from Latin coluber, snake) are a family of snakes. With 304 genera and 1,938 species, they are the largest snake family, and include roughly two-thirds of all known living snake species.
Colubrid species are found on every continent except Antarctica.
While most colubrids are not venomous (or have venom that is not known to be harmful to humans) and are considered harmless, a few groups, such as genus Boiga, can produce medically significant bites, while the: boomslang, twig snakes, and the Asian genus Rhabdophis have caused human fatalities.
Colubridae also include the few species of actually poisonous snakes, notably Rhabdophis tigrinus.
Some colubrids are described as opisthoglyphous, meaning they have elongated, grooved teeth located in the back of the upper jaw. The opisthoglyphous dentition appears at least twice in the history of snakes. These are unlike those of vipers and elapids, which are located in the front.