Black and Yellow Mangrove Snake also known as Cat snake, as they have eyes with vertically elliptical pupils similar to those found in felines. Cat snakes are nocturnal hunters that become active at twilight. By day their pupils are contracted to narrow vertical slits, but as night falls the pupils expand to a nearly circular shape to let in as much light as possible. The body is thin and laterally compressed, and the head is triangular and distinct from the neck. Their short rear fangs can deliver a mild venom that is not dangerous to humans. Found mainly in Asia