@Onychorhynchus coronatus They are, but the Dianas have more space and are now breeding here and not too far up the road there is now a breeding pair of Roloways at Yorkshire Wildlife Park.
Twycross have quite a good selection of African primate species by the looks of it, I know that Matt Hartley was / is the studbook keeper for one species of guenon but I can't remember if it was the Roloway or some other species.
