Also calaw, callow. A species of Arctic duck, Anas (Fuligula, Harelda) glacialis, called also Long-tailed or Long-keeled Duck, a winter visitor to Orkney and Shetland.
1792. Statist. Acc. Scotl., V. 189. Lyres, calloos, wildgeese. Ibid., VII. 546. The calaw.
1806. Neill, Tour Orkney & Shetl., 79 (Jam.). The calloo—named from its evening call, which resembles the sound calloo, calloo, arrives from the arctic regions in autumn, and spends the winter here.
