Captive orca welfare has become one of the most high-profile debates in zoo and marine park ethics, with evidence of significant psychological suffering in captive killer whales.
Captive orcas face welfare problems that appear fundamentally incompatible with the biology of one of the most cognitively and socially complex animals on Earth. Their large brains and vast ranging needs cannot be met in any tank. Stereotypic behavior, elevated aggression, abnormal social dynamics, and shortened lifespans all indicate chronic psychological suffering. The ethical question of phasing out captive orca programs while providing the best possible care for existing individuals who cannot be released represents a major ongoing challenge.