Orcas in marine parks have been the subject of major welfare debate, while wild orca populations face separate but serious welfare challenges from prey depletion and pollution.
Captive orca welfare represents a landmark case in the recognition of animal psychological suffering. The evidence from collapsed dorsal fins, stereotypic behaviour, aggression, shortened lifespans and the complete disruption of lifelong family bonds is clear and has transformed public understanding. Wild orca welfare challenges are different but serious: the Southern Resident population faces salmon shortages that mean females are often in nutritional deficit, forgoing reproduction in poor years. PCB accumulation in the fatty tissues of orcas causes chronic immune suppression and reproductive failure. Both captive and wild orca welfare challenges share the common theme of humans disrupting the conditions these animals require to thrive.