How to Identify the Blue Coral Snake (Identification Guide)
The Blue Coral Snake is a strikingly colored, highly venomous elapid identified by its deep iridescent blue-black body, red head and tail, and smooth, glossy scales.
Read the full Blue Coral Snake encyclopedia entry →
Key identifying features
The Blue Coral Snake (Calliophis bivirgatus) is one of the most visually striking snakes in Southeast Asia, identified by a deep, iridescent blue-black body contrasted with a vivid red head and red-tipped tail. This combination of a dark, glossy body punctuated by bright red at both ends is unmistakable and sets it apart from nearly all other snake species in its range.
Coloration & pattern
The body is a rich, glossy blue-black, often with one or two thin pale blue or whitish stripes running along the lower sides in some subspecies, adding subtle linear detail to the otherwise solid dark coloration. The head is bright red, and the underside of the tail is also vividly red, sometimes displayed as a warning when the snake is disturbed by curling the tail to expose the color. This striking red-and-blue combination serves as an aposematic, or warning, signal to potential predators.
Head, eyes & scales
The head is small and only slightly distinct from the neck, colored a vivid red that contrasts sharply with the dark body. The eyes are relatively small with round pupils, typical of elapids. Scales are smooth and highly glossy, enhancing the iridescent quality of the blue-black body coloration, particularly noticeable in direct light.
Size & body shape
Adults typically reach 1 to 1.8 meters in length, with an unusually slender, almost cylindrical body for an elapid of its size. The tail is relatively short and often held curled when the snake is threatened, displaying the red underside as a warning signal.
Range & habitat where you'll see it
The Blue Coral Snake is found in lowland and hill forests across parts of Southeast Asia, including Thailand, Malaysia, Singapore, and Indonesia. It is largely fossorial and secretive, spending much of its time hidden beneath leaf litter, logs, or loose soil, and is only occasionally seen on the surface, typically at night or after rain.
How to tell it apart from look-alikes
The Blue Coral Snake's deep iridescent blue-black body combined with a bright red head and tail is highly distinctive and not closely matched by other species in its range, reducing the likelihood of confusion. It differs from true coral snakes of the Americas, which show banded patterns of red, black, and yellow or white rather than a solid blue-black body. Its glossy, smooth scales and slender build further distinguish it from thicker-bodied vipers that may share overlapping habitat.
Frequently asked questions
Is the Blue Coral Snake dangerous?
Yes, it is highly venomous, and its striking coloration serves as a warning signal to potential predators.
What is the most distinctive feature of the Blue Coral Snake?
Its deep iridescent blue-black body paired with a bright red head and red-tipped tail.
How does the Blue Coral Snake differ from American coral snakes?
It has a solid blue-black body with red only at the head and tail, rather than the red, black, and yellow banding seen in true coral snakes of the Americas.
Where is the Blue Coral Snake found?
In lowland and hill forests of Thailand, Malaysia, Singapore, Indonesia, and nearby parts of Southeast Asia.
Why does it display its red tail?
It curls its tail to expose the bright red underside as a warning display when threatened.