How to Identify the Blue Krait (Identification Guide)

Key identifying features

The Blue Krait is a strikingly patterned nocturnal elapid recognized by alternating narrow bands of pale blue-white and glossy blue-black running the length of its body. The bands are typically much narrower than the dark interspaces, and the belly is uniformly pale white or cream without banding, a useful trait for distinguishing it from similarly patterned harmless species. A raised vertebral ridge running down the center of the back gives the body a subtly hexagonal or triangular cross-section, which is a classic krait trait shared across the genus.

Coloration & pattern

The dorsal ground color ranges from a deep bluish-black to slate gray, crossed by 25 to 40 or more narrow, pale blue to whitish bands that may fade or become less distinct toward the tail. Juveniles tend to show more vivid contrast between bands than older adults, whose colors can dull with age. The head is typically a solid glossy black or dark blue-gray with no obvious pattern, and the pale banding does not usually continue onto the head itself.

Head, eyes & scales

The head is small, only slightly wider than the neck, and blends smoothly into the body without a distinct broadening, unlike many vipers. Eyes are relatively small with round pupils, consistent with the elapid family and its diurnal-resting, nocturnal-hunting habits. Scales along the vertebral row are noticeably enlarged and hexagonal, forming the raised ridge that helps identify kraits in hand or in close photographs. The scales are smooth overall, giving the snake a glossy sheen under light.

Size & body shape

Adults commonly reach lengths of about 100 to 150 centimeters, with some individuals growing longer. The body is moderately slender and cylindrical for most of its length but appears triangular in cross-section due to the enlarged vertebral scale row and flattened sides near the belly. The tail is relatively short and tapers gradually to a point.

Range & habitat where you'll see it

This species is associated with lowland and hill forests, agricultural fields, and areas near water across parts of Southeast Asia. It is largely nocturnal and terrestrial, often found sheltering by day under debris, in burrows, or near human dwellings, becoming active and moving in search of prey after dark.

How to tell it apart from look-alikes

The Blue Krait can be confused with other banded elapids and with harmless banded colubrids. The key differentiators are the narrow pale bands set against much wider dark interspaces, the plain unbanded pale belly, and the raised hexagonal vertebral scale row that creates a subtly angular body shape. Many mimic species lack this vertebral ridge and instead have a rounded body in cross-section. Banded wolf snakes and similar nonvenomous species often show more irregular or broken banding and lack the glossy, uniform sheen typical of kraits.