Types of cat-eyed snakes

Leptodeira is a genus of small to medium snakes in the family Colubridae, the largest and most diverse snake family. Like most colubrids, they have a slim build, smooth scales, a distinct head, and large eyes. Their defining feature is the eye itself: a vertically elliptical pupil that contracts to a narrow slit in bright light, an adaptation seen in many night-active snakes. This is the trait behind the group's common name, cat-eyed snakes.

The genus ranges across the warm parts of the Americas, from the extreme southern United States in Texas through Mexico and Central America and into much of South America. Its members favor lowland and mid-elevation habitats with standing or slow water, including rainforest edges, wetlands, ponds, and humid scrub. They are strongly nocturnal and are often found at night near water or moving through low vegetation.

In general terms, you can recognize a Leptodeira by the combination of a moderately slender body, a head clearly wider than the neck, very large eyes with a vertical cat-like pupil, and a patterned back. Many species carry a series of dark blotches, rhombus shapes, or saddles along a lighter ground color, which is the source of names such as the Rhombic Cat-eyed Snake and the Ornate Cat-eyed Snake. Adults are typically modest in length rather than large.

Leptodeira are rear-fanged, meaning they have enlarged grooved teeth set toward the back of the upper jaw and a mild venom delivered through chewing rather than a fast frontal strike. This venom is adapted for subduing their small cold-blooded prey and is not considered medically dangerous to people; bites are uncommon and usually cause only minor local effects. Even so, no wild snake should be handled. If a bite occurs and any unusual or worsening symptoms appear, contact US Poison Control at 1-800-222-1222 or local emergency services rather than waiting it out.

Ecologically these are specialized predators with a strong preference for amphibians. They feed heavily on frogs, toads, tadpoles, and frog eggs, and some will also take small lizards. Their nocturnal hunting near water matches this diet. Like most colubrids in the genus, they are egg-laying, with females depositing small clutches that develop without parental care. By day they shelter in vegetation, leaf litter, or crevices, emerging after dark to hunt.