カナダガン
Two Bering Sea species, the Steller's sea cow ("Hydrodamalis gigas") and spectacled cormorant ("Phalacrocorax perspicillatus"), are extinct because of overexploitation by man. In addition, a small subspecies of Canada goose, the Bering Canada goose ("Branta canadensis asiatica") is extinct due to overhunting and the introduction of rats to their breeding islands.