Modern zoos justify their existence through conservation, education, and research, but their track record on animal welfare and conservation outcomes demands critical evaluation.
The welfare costs of confining wild animals must be weighed against genuine conservation benefits. Evidence for zoo-based conservation impact is mixed; successful reintroduction programs exist but are rare. Modern accredited zoos have improved welfare through larger naturalistic enclosures and better enrichment, but many animals in substandard facilities still suffer profoundly. The spectrum from world-class sanctuaries to roadside menageries is vast.