Types of ground snakes

Atractus is a genus of small, slender snakes in the family Colubridae, the largest and most diverse family of snakes in the world. With well over a hundred described species, Atractus is one of the most species rich snake genera on Earth, and our database tracks 75+ of them. They are commonly called ground snakes because they live almost entirely on or under the ground. New species are still being described regularly, which tells you how poorly explored and easy to overlook these animals are.

The genus is centered on Central and South America. Members range from Panama and the rest of lower Central America down through the Andes and across the Amazon basin into much of tropical South America. Many species have tiny ranges, sometimes a single mountain valley or river drainage, which is part of why the genus has so many members. Typical habitat is humid forest, cloud forest, and montane areas, where the snakes shelter in leaf litter, loose soil, rotting logs, and under rocks.

Recognizing an Atractus in general terms means looking for a small snake, often well under a foot to roughly a foot and a half long, with a cylindrical body, a short tail, smooth scales, and a small head that is barely distinct from the neck. The eyes are small, fitting their burrowing life underground. Color is highly variable across the genus, from plain browns and blacks to banded, striped, or reddish patterns. Because so many species look similar and ranges overlap with other small snakes, exact identification often comes down to locality and scale counts rather than color alone.

Atractus are not considered dangerous to people. They are small, secretive, and not aggressive, and they are not known to cause medically significant envenomation in humans. They belong to a colubrid lineage without the front fangs and potent venom of vipers or elapids. As a general rule with any wild snake, the safe approach is to observe and not handle it, because field identification is unreliable and even harmless snakes can bite if grabbed. If a bite from any snake causes worrying symptoms, contact emergency services or US Poison Control at 1-800-222-1222 rather than trying to treat it yourself.

Ecologically, ground snakes are specialized feeders. Most prey on soft bodied invertebrates such as earthworms, and some take slugs, snails, or insect larvae, hunting through soil and leaf litter where these are abundant. They are egg laying, producing small clutches, and they spend much of their time concealed, becoming active in humid conditions and at night or after rain. Their quiet, fossorial lifestyle makes them an underappreciated but important part of the forest floor food web across the Neotropics.