They are mixed with carcaras in paridaza and with ducks and in the past ibises, and in Timmendorfer Strand with falconsAfaik they can't be mixed with anything but very small birds that can be easily ignored by the condor, and said birds are never mixed because condors aviaries are usually with nets with holes big enough for the birds to escape, so unless you plan a big Andean indoor closed aviary, I'm afraid they'll be the only species in their enclosure