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Leptophis ahaetulla is a semiarboreal colubrid snake found throughout Central and South America. It has a slender body with a uniformly bright green dorsum. Its venter is pale green, and a narrow black stripe extends from the eyes to the neck. This species has large eyes, round pupils, and an enlarged head shield, and it lacks a loreal scale. Keeling in the dorsal scales varies both within and between geographic populations. Like all other males in the genus Leptophis, male L. ahaetulla have a short, bilobed hemipenis.
The diet of L. ahaetulla consists primarily of treefrogs in the family Hylidae, although this species has also been documented to eat several species of lizards. When threatened, L. ahaetulla may elevate the anterior portion of its body, open its mouth, and hiss. This species may also bite if provoked, causing moderate pain and a temporary reaction in humans.