Ogilby's duiker (Cephalophus ogilbyi), is a small antelope found in Sierra Leone, Liberia, Ghana, southeastern Nigeria, Equatorial Guinea's Bioko Island, and, possibly, Gabon. No subspecies are recognized.
The two former subspecies, the White-legged duiker Cephalophus crusalbum and the Brooke's duiker Cephalophus brookei are considered as distinct species since 2011.
Ogilby's duikers weigh up to 20 kilograms and have a shoulder height of up to 56 centimeters. They vary in color from chestnut to mahogany to a deep brown, and have massive hindquarters typical of duikers.
Ogilby's duikers live mainly in high altitude rainforest where they feed mainly on fallen fruit.
The total population is estimated at 12,000 individuals