Southern Resident Killer Whales in the Salish Sea represent one of the most intensively studied and welfare-documented orca populations. Their decline illuminates how prey scarcity, noise pollution, and contaminants affect individual animal wellbeing.
Individual Southern Resident orcas experience documented nutritional stress that causes mothers to lose calves and young animals to die before reproductive age. The inability to forage effectively due to prey scarcity and noise pollution is a genuine, measurable welfare harm at the individual level. Dam removal on the Klamath River - completed in 2024 - is expected to restore some salmon habitat and represents a meaningful welfare intervention. Whale-watching vessel restrictions during active foraging provide measurable benefits for individual orca foraging success.