Edinburgh Zoo don't have a lot of the African "big 5" any more - they made the decision on the basis of cost, conservation and animal welfare. An elephant so bored it shows stereotypical behaviours is cruel. Places like Prague Zoo specialise in elephants now - anyone ever over there should go and visit, an amazing facility. Giraffes have been away from Edinburgh for a wee while for similar reasons. Polar bears were moved to the Highland Wildlife Park for the same, ditto the wolves. The facilities for those animals up there are excellent. Well worth the trip
The "main draws" at the zoo these days are the Pandas, the chimps (Budongo Trail is excellent?) and the koalas and meerkats. And the penguins still draw people. It is where the money is made to undertake the conservation of the less "sexy" species they also house.
Zoos have changed from being a Victorian-born place to go look at the animals to places driven by conservation and research - so the emphasis and our own childhood experiences are very different. Not that seeing a pacing, demented polar bear or elephant was ever much fun.
:hmmm