Narwhals are sensitive Arctic specialists whose welfare depends on sea ice dynamics that are being dramatically altered by climate change.
Narwhals trapped in ice during sassats experience prolonged suffocation as leads close. Climate change initially creates more open water which reduces ice entrapment risk, but also increases killer whale access to narwhal ranges creating new predation pressure. The loss of sea ice removes the anti-predator refuge narwhals depend on, creating chronic predation stress. Climate change represents a fundamental alteration of the ecosystem that determines narwhal welfare.