How to Identify the Mustard-Bellied Snake (Identification Guide)

Key identifying features

The Mustard-Bellied Snake (Drysdalia rhodogaster) is a small, mildly venomous elapid found in southeastern Australia. Its most distinguishing feature, reflected in its common name, is a vivid mustard-yellow to golden-orange belly that contrasts sharply with a darker, more subdued back, making the underside a key field mark when the snake is visible from below or the sides.

Coloration & pattern

The back is generally grey-brown to reddish-brown or olive, typically without strong pattern, though a faint darker vertebral stripe can sometimes be present. The belly is a striking mustard-yellow to golden-orange, often becoming more vivid toward the tail, providing strong contrast with the duller dorsal coloration. This bright ventral color is the species' most reliable identifying trait.

Head, eyes & scales

The head is small and only slightly distinct from the neck, typical of small ground-dwelling elapids. Eyes are small with round pupils. Scales are smooth, giving the body a sleek, matte-to-low-sheen finish.

Size & body shape

This is a small snake, with adults typically reaching 30–40 cm (12–16 in) in length. The body is slender and cylindrical, well-suited to moving through leaf litter and low ground vegetation.

Range & habitat where you'll see it

The Mustard-Bellied Snake is found in parts of southeastern Australia, favoring coastal heath, woodland, and forest floor habitats with abundant leaf litter. It is secretive and largely active during cooler parts of the day, sheltering under logs, rocks, and dense ground cover.

How to tell it apart from look-alikes

The vivid mustard-yellow to golden-orange belly is the clearest way to distinguish this species from other small, similarly plain-backed elapids in its range, many of which show paler cream, pink, or red bellies instead. Careful attention to the vivid, saturated yellow-gold tone of the underside, combined with a subdued grey-brown to olive back, helps separate it from closely related small elapids sharing similar habitats.