Well, it's definitely an interesting idea but there's a few things here...
I have tallied animals according to how often they appear on zoo websites, for over 50 zoos. The attached link will bring you to my Google document where you can suggest changes.
Many zoo websites are notorious for still listing species they do not have, or in some cases never have had. As it is I'm already skeptical of the entire document as there are several major errors I've already seen by a quick run-through:
Bronx's last Maxwell's Duiker died in 2015 (and afaik they do not keep Green Acouchi either.) In the same vein Bronx has not had Sumatran Rhino in many years, the species has been absent from North America for nearly a decade.
Saiga have not been at either San Diego facility for some two decades. They also do not keep Red-shanked Douc and have not in years. They have never to my knowledge kept Bottlenose Dolphin - the page in general is labeled cetacean I believe. San Diego also does not keep African Leopard, Florida Manatee (never), or Giant Panda (any longer, lost them last year).
Jabiru, I'm unable to get the document to show me where you list, but assuming it is DWA, the last bird is no more.
Similarly if your Guanay Cormorant listing is at Bronx, those birds too are gone.
And too the Hawaiian Short-eared Owl is gone if LA's.
Philippine Eagle now held by Jurong.
All "Bengal Tigers" outside India are either hybrids or mislabeled other subspecies.
If there is an animal you have seen at a certain zoo that I missed
Well... I could give you probably 50 species with lists of more than 75-100 holders right off the bat, I know of more than 130 holders of Bald Eagle in North America alone for instance. San Diego's tallies are way off just from what bits I can see.
I hope you find this useful!
Um, it's a good start but I am sorry to say it is very full of errors... The idea is good but unfortunately using zoo websites is not the best way to be accurate on this.
Here is a link to a public version that anyone can edit.
If this project is important to you, you might want to keep it to your editing access only to avoid accidental misformatting and other issues.
Sorry this is only your second response here on the site.