Narwhals are among the most specialized marine mammals on Earth and among the most vulnerable to rapid Arctic change, with welfare implications of ocean warming and human disturbance accelerating.
Narwhal welfare is uniquely threatened by the convergence of climate change and increasing Arctic maritime access. These specialized animals show extreme stress responses to ship encounters — cardiac reactions that can be fatal even when the physical threat is distant. As Arctic sea routes open with climate warming, ship traffic through narwhal core habitat is increasing rapidly. Sea ice loss is eliminating the habitat features narwhals have evolved to depend on, forcing range shifts with unknown welfare costs. The combination of climate stress, increasing ship disturbance, and narrow ecological specialization makes narwhal welfare one of the most acute climate-linked marine mammal concerns. Routing ships away from critical narwhal habitat during sensitive seasons is an achievable near-term welfare intervention.