Two-colored dwarf snake or bicoloured reed snake, Calamaria bicolor Duméril, Bibron & Duméril, 1854 of south Sarawak / Borneo – around 900m ASL

Calamaria bicolor is a small fossorial snake in the family Colubridae and the subfamily Calamariinae. Adults are slender with smooth glossy scales, a short tail, and a blunt head only slightly distinct from the neck, features typical of reed snakes. The species lives within moist forest soils and leaf litter where it burrows and forages, and it is most often encountered under logs or stones after rain. Its diet consists mainly of earthworms and other soft bodied invertebrates, taken by rapid ingestion rather than constriction. Reproduction is oviparous with small clutches as in congeners. Available records place the species on Borneo in a variety of forest types, including some disturbed habitats, although its secretive habits make it difficult to survey. No major range wide threats are evident, but limited field observations mean that aspects of its ecology and population trends remain poorly documented.