I'm not sure why they want both Drill and Mandrill. By the time this is built/becomes reality, they could have a good large group of Mandrills if they let them keep on breeding. They are more colourful than Drills which are otherwise almost identical, but also much less common and therefore harder to obtain founder members for new groups in zoos. If I were them I would leave Drills to others who already keep them, and keep an unrelated species instead- Mangabeys (all species) are another Forest primate for example, and make an excellent active exhibit.
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