Lions are the only truly social wild cats and their welfare in captivity depends critically on appropriate pride structure, sufficient territory, and opportunities to express natural social behaviors.
Lion welfare in zoos has historically been compromised by enclosures too small to support natural social structures and behavioral repertoires. Male lions separated from companions show increased stereotypies and stress, reflecting the deep social bonds between coalition males. Female lions without hunting opportunities and sufficient space for patrol and range behavior show elevated cortisol and reduced behavioral complexity. The shift toward larger, more complex zoo lion habitats with appropriate social groupings has significantly improved welfare outcomes at leading institutions. Enrichment that challenges lions cognitively and physically, including food puzzles, novel scents, and varied substrates, reduces inactivity and stereotypic behavior. Social stability within the group is a precondition for positive welfare.