Annonidium mannii and Pentaclethra macrophylla are preferred. There have been reports of the bay duiker preying on birds (without feeding on the legs and wings) and the embryo of unhatched eggs, carrion, remains of African porcupines and kusimanses, termites, beetles and ants. Dog food may serve as supplement for captive individuals. Reproduction Females may conceive by the age of eighteen months. Breeding occurs throughout the year, and no clear peaks are known. A study in Gabon recorded birth peaks before or during maximum abundance of fruits. In central Africa, births peak in January and February. Oestrus lasts for just eighteen hours. The rutting male pursues a female in oestrus continuously. The male might be humming and may move its foreleg outward. If receptive, the female will allow the male to mount by shifting her tail to a side. Gestation lasts for about 240 days, following which generally a single offspring is born. The infant weighs nearly , and its coat is dark reddish-brown. The brighter reddish-brown to chestnut color develops by five to six months. For the first few weeks after its birth, the infant is kept concealed in dense vegetation when the mother is away. The offspring can start taking solid food within a few weeks. Weaning occurs at around three-and-a-half months. The lifespan of the bay duiker averages 17 to 18 years. Habitat and distribution The bay duiker prefers old-growth or primary forests. Home ranges of females are around large, and those of males are twice the size of those of females. This duiker formerly occurred in the lowland forested areas (warm, moist rainforests) of Guinea. Nowadays, the bay duiker can be found in moist forested islands and riparian forests in the savannas of Guinea and northeastern Sudan. The bay duiker is native to several countries in western and southern Africa: Angola, Cameroon, Central African Republic, The Democratic Republic of the Congo, Côte d'Ivoire, Equatorial Guinea, Gabon, Ghana, Guinea, Guinea-Bissau, Liberia, Nigeria, Sierra Leone and Togo. It is feared to be extinct in Uganda. Threats and conservation The bay duiker has been historically overhunted across its range for bushmeat. A 2007 study of the extinction of the bay duiker in the Ipassa Makokou Biosphere Reserve (Gabon) held overhunting responsible for the elimination of the species from the reserve. The survival of the bay duiker is also threatened by human settlement and agricultural expansion due to this duiker's preference