List of zoos by number of species held?

Shirokuma

Well-Known Member
Does anyone know if there is a list of zoos worldwide, ranking them by size according to the number of species held?
 
I'm pretty sure there's no such list, because it changes too fast. It's also a little dependent wether you count by zoos or by zoological organisations because both Antwerp and London run at least two zoos.

Moreover, do you count animals off exhibit or not and do you count fish and invertebrates? Solely on species, the names that are bound to appear in the top 5 in Europe are both the Berlin's, Moscow and Plzen Zoo (The last two hold and breed a large number of small animals behind the scenes).
 
There was actually an old site that had a list exactly like this, but it didn't include fish/inverts, and many of the collections had incomplete records. It's gone now. San Diego was first, then Moscow I believe, but as some animal groups were missing that may be incorrect.
 
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