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Black Guillemot Cepphus grylle - Winter plumage. L 34cm. Charming, coastal auk. Swims well and dives for Butterfish and other bottom-dwellers. Sexes are similar. Adult in summer has mainly sooty-brown plumage except for striking white patch on wing. Has red legs and orange-red gape. In winter, has scaly grey upperparts and white upperparts; black wings and contrasting white wing patch are retained. 1st winter bird is similar to a winter adult but white wing patch contains dark markings. Voice Utters high-pitched whistling calls. Status Local year-round resident in inshore waters of Ireland and N and W Scotland.