sooty shearwater

mutton bird

or mut·ton-bird

noun
  1. any of several long-winged seabirds, often used as food, especially Puffinus tenuirostris (short-tailed shearwater) of Australia and Puffinus griseus (sooty shearwater), which breeds in the Southern Hemisphere and winters in the Northern Hemisphere.

Origin of mutton bird

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018