While driving in Gabon (region of Sangala), I saw this small "stall" next to the road where they were selling this monkey. Unfortunately, have not the exact geo-point of the photo.
Habituated Mona monkey saw in Lekki conservation center
10 in trees
8 in trees
The guenons (/ɡəˈnoʊn/ or /ˈɡwɛnən/) are the genus Cercopithecus of Old World monkeys. Not all members of this genus have the word "guenon" in their common names; also, because of changes in scientific classification, some monkeys in other genera may have common names that include the word "guenon". Nonetheless, the use of the term guenon for monkeys of this genus is widely accepted.