Boiga andamanensis

The Andaman cat snake is a rear-fanged snake endemic to the Andaman Islands. The body is long, thin and flattened from side to side, with smooth back scales. It is pale reddish or greyish brown above, uniform or with a series of dark brown spots along the spine or thin cross-lines, with white upper lip scales (Wikipedia, general species account).

It is nocturnal and lives in trees, occasionally seen on the ground searching for prey. Its mild venom can paralyse small prey. It preys mainly on geckos, other small lizards (especially of the genus Calotes) and rodents, and will occasionally eat tree frogs and bats.