All of which makes Vint Virga's project — sustaining that illusion, by incremental changes in how the animals are treated — seem more than a little quixotic. Last August, the Costa Rican government announced it was closing all its zoos. The new policy, the government declared, was "no cages." (A court ruling has so far kept the zoos open.) I think we're moving slowly toward the same sensibility. In 25 years, there will likely still be some way for Americans to see exotic animals. But I will be pretty surprised if those places have cages, mirrors, smoke machines, and conference-room tanks for 12,000-pound whales. There may be nature preserves. But it seems to me that we're pretty rapidly reaching the end of the era of the modern urban zoo
strong concluding paragraph, has sources and evidence