Types of slender snakes

Tachymenis is a genus of small snakes in the family Dipsadidae, a large and diverse group of mostly New World colubroid snakes that also includes many ground snakes, water snakes, and snail-eating species. Members of Tachymenis are sometimes called slender snakes for their narrow, lightly built bodies. The genus is a modest one, and SnakeFinder lists examples such as the Peru Slender Snake and the Ocellated Pampas Snake. As dipsadids, they belong to the rear-fanged lineage rather than to the front-fanged vipers or elapids.

These snakes are found in southern and western South America, across countries such as Peru, Bolivia, Chile, and Argentina. They occupy a range of habitats typical of the region, from high Andean slopes and grasslands to scrub and the open plains that give the pampas snake its name. They tend to be terrestrial and secretive, sheltering under rocks, logs, and ground cover, and they are most active when temperatures suit their small bodies. As with most dipsadids, diet centers on small prey: amphibians, lizards, and other small animals they can overpower.

Tachymenis snakes are rear-fanged, meaning they have enlarged grooved teeth toward the back of the upper jaw and a mild venom used to subdue small prey. They are generally regarded as harmless to humans and are not aggressive, but no wild snake should be handled. A bite from a rear-fanged species can cause local effects in some people, so treat any wild snake with respect, do not attempt to catch or handle one, and seek medical care for any bite. In the United States contact Poison Control at 1-800-222-1222, or contact local emergency services in your area.