Wiki...
Native to south and east Africa... (among other things 'adaptable')
Diet -
The Vervet Monkey eats a wide range of fruits, figs, leaves, seeds and flowers. It also eats birds' eggs and young chicks, and insects (grasshoppers and termites). In human inhabited environments it will eat bread and various crops; especially maize.
It also said before this, that their Social Structure was one of diurnal (daily) and social.
I dont see they have adapted very well on St Kitts, but about the best they can make of such a mess up, they could not control.
Im guessing the problem began with tourism, but wonder how old it is? Certainly not 300yrs!
@Recycle, i think maybe a comparison in their living conditions in terms of tendencies from individual monkeys from each group (St Kitts/Africa) would be an eye opener perhaps. Or just a group behavioural comparison at least. Id favour the native monkey's long term success for sure.