@jayjds2 You mentioned earlier that Zoo Atlanta's Reptile House "seems like Fort Worth's MOLA but on steroids". I have not been to Atlanta since 2008 but I toured MOLA a couple of years ago and I counted exactly 100 exhibits, 114 species of reptile/amphibian and 156 species including all animals. There are some enormous ceiling-to-floor vivariums and the huge Gharial and Saltwater Crocodile pools are outstanding. Atlanta's addition looks fantastic but judging from photos and videos it seems to not be in the same league as the Reptile House at Fort Worth. I'm not sure that there are many zoos in the world that have such a wonderful structure to house cold-blooded critters as MOLA is simply a must-see for any serious zoo enthusiast.
I used to have an online copy of the International Zoo Yearbook and I recorded a total of approximately 200 species and over 1,000 specimens of reptiles/amphibians at San Diego Zoo. However, I wouldn't be surprised if half of those totals are off-show and the Tuataras not being available for public viewing is a significant disappointment. I'm waiting on a friend to see if the latest numbers are any different but the figures that I had were from 2016. San Diego's terrariums in the old Reptile House are much larger than they might first appear and the outdoor yards for reptiles are the best of their kind on the continent. I think that the only zoo that could challenge San Diego's dominance in this particular category would be Fort Worth.
To echo the sentiments of a couple of people on this thread, I personally don't rate conservation programs as highly as others when it comes to determining the overall quality of a particular zoo. As
@sooty mangabey said, "for some of us, an enormous collection, showing a massive range of species, is a goal" and I agree with that summary. Many zoo guidebooks don't even list conservation programs and the average visitor really doesn't care at all. I understand that us 'zoo nerds' do care about the conservation of species but the average amount of money spent on conservation from AZA zoos is 2% of the total budget of each facility. Even if a zoo like Atlanta spends HALF of its conservation budget on reptiles and amphibians then that is still only 1% of the total annual budget of the zoo...a paltry sum. I just finished reading the book on the link below and while the publication was hit-and-miss overall, there were loads of statistics in regards to zoos and the amount of dollars spent on conservation programs and zoos are simply not doing enough in terms of their funding for both in-situ and ex-situ programs.
https://www.amazon.ca/Ark-Beyond-Ev...d=1527795063&sr=1-1&keywords=zoo+conservation
Ranking zoos is so difficult and possibly contentious and how does one factor in all of the intangibles when it comes to reptiles and amphibians? For example:
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Saint Louis Zoo: 100 species on-show and possibly another 100 off-show (just like San Diego) in a gloriously historic Reptile House. But is that structure not modern enough for some folks? Or is it beloved because of its architecture?
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Detroit Zoo: has the great 1960s-era Reptile House and then one of the world's only all-Amphibian buildings. However, are there are enough species to satisfy everyone?
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Omaha's Henry Doorly Zoo: at least 120 terrariums scattered around the zoo and my information is that Omaha has 240 species of reptile/amphibian and possibly more than any other zoo in North America. Does that make Omaha #1 or should we analyze their conservation programs too? Half of those species are off-exhibit, which is another negative.
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Dallas Zoo: 125 exhibits and a massive off-show collection.
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Los Angeles Zoo: Only 70 species of reptiles/amphibians but two superb, new, modern buildings and I've gone behind-the-scenes in both structures.
So, is Los Angeles Zoo a 'better' zoo for cold-blooded animals than Dallas? The zoo in Texas has almost double the species and therefore many zoo enthusiasts would choose that one...BUT the California zoo has a more modern pair of buildings. How to choose?
Omaha beats everyone in terms of total species, but there isn't even a Reptile House there and a lot of the herps are off-exhibit.
Each to their own when it comes to evaluating zoos...