Diergaarde Blijdorp in the Netherlands has West African nile crocodiles (Crocodylus niloticus chamses), not sure if any pure ones are still kept in America?
Other species I can think of that have not been mentioned:
- Central African leopard (Panthera pardus shortridgei) in Pakawi Park, Belgium
- South-east Australian short-beaked echidna (Tachyglossus aculeatus aculeatus) in Planckendael, Belgium
- Javan ferret-badger (Melogale orientalis) in Brno, Czech Republic
- Gold saddle hogfish (Bodianus atrolumbus) in Zoo Duisburg, Germany
- Northern mountain viscacha (Lagidium peruanum) in Schönebeck, Germany
- New Guinea bronzewing (Henicophaps albifrons) in Prague zoo, Czech Republic
- Sumatran bamboo rat (Rhizomys sumatrensis) in Plzen zoo, Czech Republic
- Black-legged seriema (Chunga burmeisteri) in Zlin, Czech Republic
- Northern screamer (Chauna chavaria) in Zlin, Czech Republic
- Striped brook snake (Pseudoxyrhopus quinquelineatus) in Plzen zoo, Czech Republic
- St. Lucia amazon (Amazona versicolor) in Pairi Daiza, Belgium
- Western long-beaked echidna (Zaglossus bruijni) in Batu Secret zoo, Indonesia
- Cape fox (Vulpes chama) in Plzen zoo, Czech Republic
- Giant oceanic manta ray (Mobula birostris) in Nausicaa, France
- Collared falconet (Microhierax caerulescens) in Hayle, United Kingdom
- Pitta-like ground-roller (Atelornis pittoides) in Zurich zoo, Switzerland
- Bornean bearded pig (Sus barbatus barbatus) in Berlin zoo, Germany
- Sri Lankan giant squirrel (Ratufa macroura dandolena) in Leipzig zoo, Germany
- Himalayan palm civet (Paguma larvata larvata) in Dortmund zoo, Germany
- Dongola small-spotted genet (Genetta genetta dongolana) in Bellevue, Switzerland
- South-central black rhinoceros (Diceros bicornis minor) in Frankfurt zoo, Germany
- Giant coua (Coua gigas) in Walsrode Weltvogelpark, Germany
- Bulwer's pheasant (Lophura bulweri) in Pairi Daiza, Belgium
- Longheaded eagle-ray (Aetobatus flagellum) in Montpellier, France
- Ethiopian klipspringer (Oreotragus oreotragus saltatrixoides) in Valencia, Spain
- etc.
The list goes on and we are losing species every year. In the last three years we lost the only ornate eagle-ray, Orinoco river dolphin, giant devil fish, cuckoo roller, yellow-striped chevrotain, white-necked myna, etc. in captivity outside their natural range. This is the moment to travel around and see some of the species mentioned in the list before the last one dies. I recommend Antwerp especially with Amahoro, the last remaining eastern lowland gorilla.