The conservation value claimed by modern zoos must be evaluated critically alongside the welfare costs of keeping wild animals in captivity.
The conservation justification for zoo captivity is often invoked broadly but applies narrowly. The majority of zoo animals are not part of active reintroduction programs, making conservation the justification for captivity without the substance. Honest assessment requires asking whether the welfare costs borne by individual animals are justified by genuine conservation benefit. For species with successful reintroduction programs, the answer may be yes. For the broader zoo population held primarily for education and revenue, the welfare-conservation tradeoff is less compelling.