I'd be interested to know what Twycross's intentions are for the other Apes in the future also. A couple of years ago plans were unveiled for a new 'Kingdom of the Apes' for all four species, of which the Chimp Eden would be the 'first phase'. As we know, the much-needed Chimp enclosure was developed instead as a stand alone exhibit on a different site. Has planning of the rest been abandoned(or shelved) now? It would seem so.
As far as which Apes need new accomodation next, I would rank both Bonobos and Orangutans before the Gorillas.
The gorillas are a small group with only one breeding female(Ozala) and her two young sons, each of which may leave the zoo as they mature. So unless they add to the group with another/more females of breeding potential, its likely to stay much the same size into the future. (Or might they build for them and then add more?) It is also the most recent of those original 'Twycross- style' ape enclosures. As mentioned above, the extension to the Orangutan house might (unfortunately) mean they go to the back of the queue, at least for now. That leaves the Bonobos, with their sharing problem, as the next in line. Twycross still seem to set store by having the only ones in the UK so may be they will do something to improve the situation for them next? Though with other developments like the Rhinos(?) and Tigers in process I'm not expecting anything soon.
My interest for the present lies in whether the two existing empty Chimpanzee enclosures will be re-used, in another form, or demolished. I would prefer the latter as they are very outdated buildings now.
From what I understand Twycross are being urged by the studbook to renovate their bonobo enclosure - in fact, I believe they won’t be allowed any new animals until they do.
My prediction is it’ll be bonobos first, then gorillas, then orangutans.