Excellent post.
Using an example, Durrell is one of my favourite zoos that i've visited and the animals there live in excellent facilities in a zoo which has global recognition for it's conservation work. This to me makes it world class. However, to use the criteria in this thread, then it would not be considered world class because it does not feature the A-Z of zoo animals (this is where someone will dig up an old post of mine to prove my hypocrisy). Twycross Zoo features a good number of the animals typically associated with zoos yet I would rank it far, far below zoos the calibre of Jersey and Chester.
Chester is already "world-class". It is arguably the best in the UK, certainly in with a shout of best in Europe and it is also competitve when comparing on a global scale. Could it be improved? Of course. No zoo is perfect and even the self-proclaimed best in the world, San Diego has been lambasted on here recently by some members for a decline in standards. From an inside-looking-outward approach, I get the impression that Chester doesn't appear to be on a similar level to the zoos in the States when that might not neccesarily be the case.
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Very well said, I beleive this thread isn't so much 'what would make chester world class' and more what would you personally like to see at chester. Afterall what makes a zoo world class is an entirely subjective thing and I would definetly argue that hippo's, dolphins and gorillas do not make a zoo world class.