Besides Gladys Porter Zoo, other United States zoos that kept Hirola (Beatragus hunteri) in the past included the following facilities
Dallas Zoo
San Diego Zoo
San Diego Wild Animal Park
Los Angeles Zoo
And
Busch Gardens Tampa
At the San Diego Zoo, they were kept in Horn and Hoof Mesa, but I dont know exactly which exhibit
At the Los Angeles Zoo, they were kept in a 3 different places, 1 place was the grassy hillside paddock that currently holds Lesser kudu (Tragelaphus imberbis), that exhibit held 1 male and several females, the other exhibit was where the Masai giraffes (Giraffa cameleopardus tippelskirchi) currently live, 1 male lived with the giraffes. They were also in the row of hoofstock paddocks that holds species like Spekes gazelle (Gazella spekeii) and Chocoan peccary (Catogonus wagneri), like Gladys Porter Zoo, Los Angeles Zoo actually bred their Hirola (Beatragus hunteri)
At the San Diego Wild Animal Park, they were in one of the multi acre field exhibits, but I dont know exactly which one
At the Gladys Porter Zoo, besides being off exhibit, they were in the paddock that currently holds Grants zebra (Equus quagga boehmi) and Beisa oryx (Oryx beisa beisa)
As for Dallas Zoo and Busch Gardens Tampa, I dont know which parts of those zoos they were held
Sadly, the Kenyan government placed a ban on the import of Hirola (Beatragus hunteri) from their country, but I think I remember hearing about a semi captive breeding population of them, can anyone confirm this ?
@Tim Brown, do you by any chance have any exact dates as to when that Hirola (Beatragus hunteri) at GPZ died ?