黑背信天翁 Phoebastria immutabilis

A large seabird with very long, narrow wings; much larger than shearwaters and petrels. Unmistakable with white body, dingy pinkish bill, and dark markings on underwing. Fairly common offshore throughout North Pacific, as far north as the Bering Sea. Occasionally seen from shore. Breeds mainly in Hawaii, where it is often confiding and unafraid of humans. Nests on the ground in coastal areas of Kauai and northern Oahu; abundant in the Northwestern Hawaiian Islands. Smaller colonies also exist off Japan and Mexico. Calls include whinnying, low cow-like “moo,” soft grunts, and squeals. Also claps bill.