I am having the same problem as gentle lemur, however I'll answer here.
Part of animal management? No.
Which enclosure is your favourite? Chester Zoo's Realm of the Red Ape
Why?
The enclosures are really well planted and the poles really tall allowing the orangs to climb and swing as well as look out across the rest of the zoo. Also, the building gives a better reflection of a South-east Asian eco-system than the others as there are a number of smaller animals - including some which are quite rare in zoos. Finally, the sumatran orangs have two outdoor enclosures as well as the building's bottom floor making it, in my opinion, a better exhibit for the inhabitants than the other two.
If you could change one thing about the Chester Zoo enclosure what would you change and why?
A greater effort could have been made to make the orang enclosures more natural, I don't really mind the poles and fire-hoses but the vomit-green fence is particularly off-putting.
If you could change one thing about the Hagenbeck Zoo enclosure what would you change and why?
I like the idea but the cost is ridiculous for what is quite a small enclosure. The best solution I have to this is that, for the height of the area, the climbing structures do not seem to be very tall (or at least tall enough to fully utilise the space). Therefore, I would improve it by heightening the climbing structures.
If you could change one thing about the Melbourne Zoo enclosure what would you change and why?
I don't see the point in spending millions on landscaping and theming moat barriers etc when the affect is ruined by highly artificial sway poles and elevated platforms. As such, I would decide whether it should be naturalistic rainforest, or a "jungle" gym and stick to that theming.
The Orang-utans in Hagenbeck Zoo share their enclosure with Dwarf Otters and the Orang-utans at Chester Zoo and Melbourne Zoo share their enclosure with Gibbons.
Do you think this will impact the Orang-utans in any way?
(Incidentally, the Chester orangs now share one of their exhibits with short-clawed otters as well.)
I don't pretend to know much about this matter, but I can't imagine the gibbons causing too much of a problem; furthermore, being more active, they present a more interesting exhibit for visitors. I can imagine more of a problem with the otters as short-claws are notoriously quite aggressive in mixed exhibits. However, I think Chester have the balance right as the otters can choose to be in the orang exhibit or in the neighbouring babirusa enclosure so that the two are not always together. Also, they only have access to one of the enclosures so the orangs have the other outdoor area and the climbing structures in that exhibit if they wish to avoid the otters.
What difference do you think it makes for the visitor?
Both species are quite active, so give visitors something more interesting to watch if the orangs are sleeping (which happens frequently). It may also present a better reflection of the rainforest eco-system where many different species interact with one another.