Chimpanzees are humanity's closest living relatives, sharing 98.7% of our DNA. Their welfare requirements in captivity reflect this proximity — they need complex social lives, cognitive stimulation, and extensive space.
The welfare of zoo chimpanzees requires meeting needs that parallel human psychological requirements more closely than any other zoo species. Social deprivation causes measurable psychological damage — solitary or pair-housed chimpanzees show depression, self-injurious behaviour, and abnormal social development. Social complexity, access to choice and agency, cognitive challenge, and appropriate group size are not enrichment extras but welfare necessities. Many zoo chimpanzee groups are too small, too socially constrained, or housed in environments that prevent the natural fission-fusion dynamics their social cognition requires. Accreditation standards are improving but must be robustly enforced to ensure chimpanzee welfare meets the species' extraordinary cognitive and social demands.