D. scabra also closely resembles Causus rhombeatus, the rhombic night adder. These two species may be distinguished by the shape of the pupil of the eye. Snakes of the genus Dasypeltis have vertical pupils, whereas snakes of the genus Causus have round pupils.Causus rhombeatus at Life Desks, Snake Species of the World. http://snake species of the world.lifedesks.org/pages/360. However, it is possible in darker areas for the vertical eyes to become round, so this is not necessarily an accurate means of distinguishing the species.
