Melanism in shearwaters and auks

Since Bryan L. Sage (Brit. Birds, 65: 527) comments on the supposed rarity of melanism in Manx Shearwaters Puffinus puffinus and indeed the Procellariiformes in general, it may be worth pointing out that a dark specimen of the Californian race P.p. opisthomelas was figured by L. M. Loomis on plate 15 of his classic monograph A Review of the Albatrosses, Petrels and

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