Boiga barnesii is the smallest cat snake in Sri Lanka and grows up to a maximum of 600 mm (24 in.) in snout-vent length. Being a nocturnal and an arboreal hunter, it mainly feeds on agamid lizards and geckos. The day time is usually spent inside a tree hole or a crevice. It’s a very timid and a mildly venomous snake and rarely attempts to bite.