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Taxonomy:

Sykes' monkey, Cercopithecus albogularis (Add)
Red-tailed monkey, Cercopithecus ascanius (Add)
Cercopithecus campbelli (Add)
Moustached guenon, Cercopithecus cephus (Add)
Cercopithecus denti (Add)
Diana monkey, Cercopithecus diana

Silver monkey, Cercopithecus doggetti (Add)
Dryas monkey, Cercopithecus dryas (Add)
White-throated guenon, Cercopithecus erythrogaster (Add)
Red-eared guenon, Cercopithecus erythrotis (Add)
Hamlyn's monkey, Cercopithecus hamlyni (Add)
Cercopithecus kandti (Add)
L'Hoest's monkey, Cercopithecus lhoesti (Add)
Lowe's mona monkey, Cercopithecus lowei (Add)
Blue monkey, Cercopithecus mitis (Add)
Mona monkey, Cercopithecus mona

De Brazza's monkey, Cercopithecus neglectus (Add)
Greater spot-nosed monkey, Cercopithecus nictitans (Add)
Lesser spot-nosed monkey, Cercopithecus petaurista (Add)
Crested mona monkey, Cercopithecus pogonias (Add)
Preuss's monkey, Cercopithecus preussi (Add)
Roloway monkey, Cercopithecus roloway (Add)
Sclater's guenon, Cercopithecus sclateri (Add)
Sun-tailed monkey, Cercopithecus solatus (Add)
Wolf's mona monkey, Cercopithecus wolfi (Add)