I feel as though the term 'world-class' reflects the popularity of an institution far more than it does the genuine quality.
I would disagree here as if any facility was called ''world-class'' due to popularity yet being plagued by bad husbandry or quality across its facility then would it really be worthy to be called ''world-class''? Would it then not just be a popular facility?
I do think there is a difference between what's a popular or a ''world-class'' facility; look at the London Zoo.
Many people know about the zoo and it's quite (in)famous. But would it be worthy of the title ''world-class''? I will come with the hot take that it doesn't, not now at least, I cannot comment too much on the historical side of it as I have never witnessed that and simply only know it as a ''hoard'' back in the day that has kept ''everything'' during its lifespan so far.
But nowadays I don't think many ZooChatters would call the London Zoo ''world-class'', most certainly not when Chester Zoo exists in the country.
Going a bit closer home I feel like Artis is in a similar boat, it's old and has many exhibits out-dated and old-fashioned. To me a true eye-sore on their look would be the infamous lion habitat, which thankfully a new one is being built for, but also various other historic exhibits like the bearpits, now home to mandrills and red pandas.
Artis in the Netherlands is very well-known and popular, but the zoo itself feels nothing like a zoo like Burgers' Zoo does, it's not as refreshing and boundry-pushing. One zoo is plagued by monument sustain whilst the other has been demolishing and refurbishing its past facilities.
Ofcourse Burgers' Zoo is also a popular name, but I'd reckon within the country itself, both are in similar level of ''known'' to the public. - based on nothing but my own experience when talking with people.
Do both Artis and Burgers' Zoo deserve the title of ''world-class''?
In my opinion only Burgers' Zoo does in this case due to them always pushing for advancements, they have done revolutionary things with their ecodisplays, however don't let this cloud the judgements too much as Artis too has done some of their own achievements within the zoo-world, for example succesfully raising a vulture chick under parent hood of two male homosexual vultures, or transporting a giraffe by plane, opening up new transportation methods for the species around the globe.
However what really to me makes the difference between the two is the overall quality of the zoos exhibits and husbandry. Where in Artis you'll see lions in a small exhibits till recently or old bear pits, and not to mention the small chimpanzee cage, in Burgers' Zoo you see animals in very spacious exhibit, sure there's a few relics of the past there as well, but not on the same level as Artis.
So, should the title ''world-class'' be given to zoos who just made name for themselves due to popularity? Or should it be given to zoos based on their overall quality?
I strongly believe in the latter, despite judging quality being very subjective and to everyone it might be different.
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I also believe this can be reflected in aquaria.