How to Identify the Yellow-tailed Cribo (Identification Guide)
The yellow-tailed cribo is a large, glossy, dark-bodied snake distinguished from close relatives by a paler, often yellowish tail region contrasting with its black or dark brown body.
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Key identifying features
The yellow-tailed cribo (Drymarchon corais, sometimes treated as a subspecies or close relative of other cribo/indigo snakes) is identified by its large size, glossy black to dark brown body, and a tail that is noticeably paler, often yellowish, tan, or cream, contrasting with the darker forebody. This tail coloration is the feature most useful for separating it from similar all-dark cribos.
Coloration & pattern
The body is typically uniform glossy black or very dark brown along most of its length, with smooth, highly reflective scales. Toward the rear third of the body and along the tail, the color lightens to yellowish, tan, or straw color, sometimes with a gradual rather than sharp transition. The belly is generally pale cream or yellow, sometimes with darker mottling near the throat.
Head, eyes & scales
The head is proportionally large but blends smoothly into a thick neck, without marked narrowing. Eyes are large with round pupils. Scales across the body are smooth and glossy, giving the classic sheen associated with cribos and indigo snakes.
Size & body shape
This is a large, heavy-bodied snake, with adults often reaching 2 to 2.5 meters or more in length. The body is thick and muscular, cylindrical in cross-section, tapering to a moderately long tail, and the overall impression is one of considerable bulk and strength.
Range & habitat where you'll see it
Yellow-tailed cribos are found in Central America and parts of South America, inhabiting lowland tropical forests, forest edges, and open or disturbed habitats near water. They are diurnal, actively foraging on the ground during the day, and are often encountered in the open, including near rivers, farmland, and settlements.
How to tell it apart from look-alikes
The key distinguishing trait from other cribos and indigo snakes is the contrasting paler tail; many related species are uniformly dark from head to tail tip, while this species shows a distinct lightening toward the rear. It can otherwise resemble the Central American indigo snake in overall size, shape, and glossy black coloration, but the yellowish tail helps separate it. As with related large colubrids, round pupils and the absence of heat-sensing pits distinguish it from superficially similar dark-colored pit vipers.
Frequently asked questions
What is the defining field mark of this species?
A body that is mostly glossy black or dark brown with a distinctly paler, often yellowish tail section.
How does it differ from the Central American indigo snake?
Both are large and glossy, but the yellow-tailed cribo shows a clear lightening of color toward the tail, which the indigo snake typically lacks or shows differently.
How large can this snake get?
Adults commonly reach 2 to 2.5 meters or more, making it one of the larger snakes in its range.
Is it active by day or night?
It is diurnal, actively hunting on the ground during daylight hours.
What habitats does it favor?
Lowland tropical forest, forest edges, and open areas near water, including farmland and settlements.
Yellow-tailed Cribo identified by the community
Recent Yellow-tailed Cribo specimens identified with Snake Identifier.
