Though when things were much more a crisis situation for the species back in the 1970s, they still exhibited one lone male (Topa Topa), who is still living, in what is now the Cape Griffon Vulture aviary; built specifically for California Condors.
I wonder if the Houston Zoo, along with several other Texas zoos, have any of their Houston Toads on exhibit as well as a successful breeding program?
I remember when the Sacramento Zoo was breeding Yosemite toads that they had a Yosemite toad on exhibit. With the condor crisis in the 1970s-1980s it made sense that they pulled everyone off exhibit but now there are several hundred and obviously there are birds that have become zoo ambassadors at several other places.
Several years ago I remember seeing a plan in an LA Zoo newsletter that showed a condor aviary along the entrance pathway (not sure where exactly)...hopefully it will happen someday.