How many zoos have them nowadays? When I was a kid I saw the occasional TV show and read the occasional book, all of which only naming the holy duo: Los Angeles and San Diego.
As to San Diego, sometimes the books would say the zoo, sometimes the WAP. I know they were always behind the scenes during the first years of the rescue operation, but were they kept at both places or just the WAP?
Mike Dee showed me the off-exhibit breeding facility in LA back in 2003. Then I got to see them too at the SDWAP a few days later.
San Diego Zoo, San Diego Wild Animal Park, Los Angeles Zoo (off exhibit only), Santa Barbara Zoo, Oregon Zoo (off exhibit only), World Center for Birds of Prey (off exhibit only), and Chapultapec Zoo