Also comparing finances is useless as average salary costs in Zurich would be at least 5x higher.
Although Zurich would still have considerably more to spend on exhibits than Plzen...
If the whole income is ten times higher and some small subsets that Zurich have to pay are 5x higher, they will certainly end up with still at least 7 times more to spend when all debts are settled and when conservation efforts are factored in!
Anyway, I feel that Zurich's exhibits other than Masoala are certainly comparable to Plzen's, with some being worse. I don't think anyone can deny that Plzen has a wonderful avian collection, even if it means being slightly less focused on getting fancier viewing opportunities (glass vs. fencing/mesh). The welfare of the birds is not compromised because their aviary is old and is completely surrounded in mesh instead of glass - in fact it is better, given the cases when birds have flown into glass by accident, thinking it is an open gap!
Some of those aviaries in the photos are much smaller for the same thing, just more densely planted and glass-fronted.
On another note, the penguin situation in Zurich doesn't seem to be ideal. As it stands, the King penguins (second largest penguin species) have an area the size of a large bedroom for over half the year. Meanwhile, during the winter, the Humboldt penguins have to stay indoors in that enclosure as well! As it stands, the King penguins have less than 3 square metres each.
From what I can see, I would much rather visit Plzen for birds. They seem the much more humble collection, where the aim is not to collect as many ABCs as possible, but instead to find species that most visiting will never have seen before, such as the Sumatran treepie and countless other examples. They are all held in conditions from average to fantastic, with the only exception being the Barn owl shed. Zurich has a much narrower interpretation of birds. I would be interested to know how many species Masoala actually holds in free flight.
Thanks TLD for the offer. I might need some help in Hellabrunn finding some of the more obscure species