@lintworm Not sure of exact numbers but there were at least three separate groups of three or more each, so definitely into double figures. One group was kept with one of the gorilla groups (guessing probably a bachelor group?).
The other answer is 'more than I'd ever seen in total before'!
@Maguari Thanks. I guess that last sentence goes for most of us, as I think there are only 5 in Europe outside of Beauval But good to know that at least some zoos still commit themselves to these beautiful monkeys (guenons in general).
I am hoping you have a lot more pictures from Beauval coming (and of neighbouring Doue + ?? coming).