There are some exceptions, Marris notes, in which zoos have played a starring role in reintroducing threatened and endangered species to the wild, including the California condor, the Arabian oryx, and Black-footed ferrets, among others.

Mileham told Vox captive breeding programs at zoos do more than just create insurance populations, and that they contribute to field conservation by providing opportunities for researchers to learn about species’ behavior, nutrition, veterinary needs, and more.

While the educational value of zoos is dubious, there’s certainly one message zoo-goers receive, if only implicitly: That it’s perfectly fine, even good, to put wild animals on display in tiny enclosures for the public’s leisure.

But there’s also this: One-third of Earth’s habitable land is devoted to cattle grazing and growing corn and soy to feed farmed animals, which has resulted in mass habitat loss for wildlife and crashing biodiversity levels.

Fashion designers are replacing leather and fur with animal-free textiles, meat companies are now selling plant-based nuggets and burgers, and in 2018, the traveling circus Ringling Bros. and Barnum & Bailey announced it would stop using animals, such as lions, tigers, and bears, in its shows.

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