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" What if zoos stopped breeding all their animals, with the possible exception of any endangered species with a real chance of being re-released into the wild? What if they sent all the animals that need really large areas or lots of freedom and socialization to refuges? With apes, elephants, big cats, and other large and smart species gone, they could expand enclosures for the rest of the animals, concentrating on keeping them lavishly happy until their natural deaths. Eventually, the only animals on display would be a few ancient holdovers from the old menageries, some animals in active conservation breeding programs, and perhaps a few rescues.
Such 'zoos' might even be merged with sanctuaries, places that take wild animal that -- because injury or a lifetime of captivity -- cannot live in the wild. Existing refuges, like Wolf Haven, often do allow visitors, but not all animal are on the tour, just those who seem like it. Their facilities are really arranged for the animals, not for the people. These refuge-zoos could become places where animal live not in order to be on display, but in order to live. Display would be incidental. "
― , Wild Souls: Freedom and Flourishing in the Non-Human World