I missed these photos of the Mappin Terrace refurb, I can't believe it! It is a considerable area.
I really am hoping that this will become a big cat exhibit, and I think there is a chance it could. My plan would be a lion enclosure, with a redevelopment of the current cat terrace to house exclusively tigers. If they were to do this, they would need to secure funding for the new tiger area, before moving the lions out, maybe this is why there is a temporary wallaby enclosure? It'll also be a chance to test the new landscaping works- before building a big, all-sing all-dancing 'Lion Canyon' and finding that it subsides, or collapses or something.
So, if the wallabies are temporary as people say, what are the odds?
Lions 2/1?
Tigers 3/2?
Bears 5/1?
Pygmy hippos 20/1?