Great apes have the highest cognitive and emotional complexity of any zoo-kept animals, requiring the most sophisticated welfare provision.
Great ape welfare represents the highest standard of obligation in zoo animal keeping. Their cognitive and emotional complexity means welfare failures cause psychological suffering as profound as they would in humans. Meeting their welfare needs requires exceptional investment in space, social management and environmental enrichment. Zoos that cannot meet this standard should not keep great apes. The ethical scrutiny applied to great ape keeping should inform broader standards across zoo animal welfare.