Great apes including chimpanzees, gorillas, bonobos, and orangutans present the most complex welfare challenges of any zoo species due to their cognitive and social needs.
Great apes with unmet social and cognitive needs develop severe stereotypic behaviours and psychological disturbance comparable to trauma responses in humans. Their long lifespans mean that welfare failures compound over decades. The best ape facilities invest heavily in social management, complex environments, and enrichment. Poorly managed facilities cause lives of chronic psychological suffering to some of the most cognitively complex animals on Earth.