The bay duiker (Cephalophus dorsalis), also known as the black-striped duiker and the black-backed duiker, is a forest-dwelling duiker native to western and southern Africa. It was first described by British zoologist John Edward Gray in 1846. Two subspecies are identified. The bay duiker is reddish-brown and has a moderate size. Both sexes reach at the shoulder. The sexes do not vary considerably in their weights, either; the typical weight range for this duiker is . Both sexes have a pair of spiky horns, measuring . A notable feature of this duiker is the well-pronounced solid stripe of black extending from the back of the head to the tail. The bay duiker is a nocturnal animal. It tends to remain solitary, but pairs can also be observed. The leopard is the main predator of this duiker. It mainly prefers fruits, but may also feed on animal matter such as bird eggs. Females may conceive by the age of 18 months. Breeding occurs throughout the year. Gestation lasts about 240 days, following which generally a single offspring is born. The lifespan of the bay duiker is typically 17 to 18 years. The bay duiker prefers old-growth or primary forests. It has been historically overhunted across its range for bushmeat. The survival of the bay duiker is also threatened by human settlement and agricultural expansion due to this duiker's preference for old-growth forests, and habitat degradation. The bay duiker is, however, still a common duiker species, and is classified as near threatened by the International Union for Conservation of Nature and Natural Resources. Taxonomy and etymology The bay duiker was first described by British zoologist John Edward Gray in 1846. The generic name probably comes from the combination of the New Latin word cephal, meaning head, and the Greek word lophos, meaning crest. The specific name dorsalis is a Latin word referring to the back surface of an object. The common name "duiker" comes from the Afrikaans word duik, or Dutch dūken (both mean "diver") owing to the tendency of this antelope to seek cover in bushes. The bay duiker is also known as the black-striped duiker and the black-backed duiker. A 2001 phylogenetic study divided Cephalophus into three distinct lineages: the giant duikers, east African red duikers and west African red duikers. The bay duiker was classified as a giant duiker along with the yellow-backed duiker (C. silvicultor), Abbott's duiker (C.