@The Hedgehog - I'm not sure that the giraffes do need a bigger area. They seemed perfectly happy when Yoda was there too. I don't know if you've been in their house, but there is specialised 'crush' in there to enable them to, for instance, receive treatment. This will have to be dismantled and re-erected on Duchess's side of the house, at some expense I would imagine. There are 3 separate areas in there while the elephant side has only 2 - more changes needed?
Zebras - your statement that a lot have lost their lives due to hoof deformities caused by the terrain is rather an exaggeration, according to the records I've kept over the many years I've been visiting the zoo. The well-publicised Uri, who died last year, came to the zoo from Usti nad Laben with deformed hooves. They weren't caused by PZ's zebra enclosure. I believe there has been concern in the past that the grass was too rich and they might do better if it was replaced with a coarser blend, but there is hardly any grass at all in the giraffe enclosure. It is mainly sandy to suit the giraffes, while the elephant side is very grassy. Hartmann's zebras are rather anti-social so I would feel that they need a large area, as they have now, so that they can keep away from each other if they so wish. And at the moment they have separate stables and yards.
I've never had any problem viewing either the giraffes or the zebras.
Anyway, I'm sure the zoo isn't the slightest bit interested in my opinions otherwise the much-needed refurbishment of the orangutan islands would at least have been started by now!