Summary Stomach contents of 139 Maxwell, 15 red-flanked and 57 black duiker were analysed with a view to investigating the range of food plants utilised by these animals and to determine their feeding preferences, seasonal and other influences on their diet and habitat dependency. Samples of stomach contents of Maxwell and red-flanked duiker were collected on the bushmeat market of Toumodi in Ivory Coast and those of black duiker at Kumasi in Ghana. The sampled animals originated from an area of about 25 respectively 50 km in radius around the markets. Whereas the sampling area in the Ivory Coast is characterised by a mosaic of Guinean semi-deciduous forest and moist savanna, the sampling area in Ghana is predominantly covered with mostly degraded secondary moist forest of the Celtis-Triplochiton -association. Fruits and dicotyle leaves constituted the most important food component in all three duiker species. Grasses were also found in all species but only in small quantities. Tubers and rhizomes were consumed regularly and in greater quantities mainly by the black duiker. Blossoms and fungi were also consumed by the three species, but had no quantitative importance. Animal matter was found only in Maxwell duikers in the form of ants. Duiker may thus be classified after Hofmann and Steward (1972) as “browsers”. The proportions of the essential food components to eachother varied seasonally very little. Types and numbers of fruits consumed fluctuated mostly with seasons which may, however, be related to their varying availability. Only some of the fruit species were evidently selectively utilised. Fruit consumption by Maxwell and red-flanked duiker was more similar to each other than to that of the black duiker. The food composition in the three duiker species studied showed that red-flanked duiker fed preferably in and around forest patches within the moist savanna, and black duiker frequented cultivations in and near moist forest. Maxwell duiker did not show a marked food-dependent habitat preference. The diversity of their food indicated that they utilise diverse habitats. None of the three duiker species is food dependent on primary forest and a large part of their food plants occurs also in secondary, to a varying degree degraded forest and savanna habitats. Duiker might contribute significantly to the distribution of some of the identified fruit-bearing plant species.