Birds of prey in general are much more popular in European zoos than in American zoos. Over here only a few native species are common in zoos at all. I think this is due to Europe's rich history with falconry.Overall owl-diversity ( less then 25 species ) seems to be very low in North America, are owls so unpopulair overthere ? In Europe there are even special owl-collections and others with a heavy focus on owls ( Uilen en dierenpark ( = owl and animalpark ) de Paay and Vogelpark Timmendorfer Strand ( had back in the 1980s about 60 owl species and subspecies ! ) spring in mind. Aren't there any specialist-collections in the US or Canada ? And in private collections, are there at least some more species and / or holders ?
Birds of prey are almost nonexistent in private collections over here. There's a few species around but almost all of them are in very low numbers.