How to Identify Allen's Coral Snake (Identification Guide)

Key identifying features

Allen's Coral Snake (Micrurus alleni) is a slender, highly venomous elapid identified by its vividly banded body of red, black, and yellow (or pale) rings, and a small, rounded head not distinct from the neck, consistent with the general coral snake body plan.

Coloration & pattern

The body pattern consists of wide red bands separated by narrower black-and-yellow ring pairs running the length of the snake, sometimes described loosely as triads depending on the specific band grouping. The red bands are typically the widest, giving the snake an overall vivid, brightly banded appearance. The head is usually black with a pale band just behind it.

Head, eyes & scales

The head is small and rounded, blending smoothly into the neck without the broad, angular shape seen in pit vipers. Eyes are small and dark, difficult to distinguish against the black head coloration. Scales are smooth and glossy across the body.

Size & body shape

Adults typically range from about 20 to 40 inches, with a slender, cylindrical body of fairly even width and a short tail relative to total length.

Range & habitat where you'll see it

Allen's Coral Snake is found in Central America, including Nicaragua, Costa Rica, and Panama. It inhabits humid lowland and premontane forests, often found on the forest floor, in leaf litter, or near streams, and is secretive and largely fossorial or nocturnal.

How to tell it apart from look-alikes

Several nonvenomous snakes in its range mimic coral snake banding, but true coral snakes such as this species have a solid black snout and small, rounded head rather than the more varied or angular head shapes of mimic species. Band width and arrangement can vary regionally among coral snakes in Central America, so identification should rely on the combination of a black snout, rounded head, and vivid red-black-yellow banding rather than any single simplified color rule.