. The birds of the British Isles and their eggs . 2 //. II Buffons Skua. 5261. POMATORHINE SKUA. 261 Pomatorhine Skua. Sfercorarius pomarvms (Temm.). The Pomatorhine, Pomarine, or Twist-tailed Skua (Plate 115)is another skua with an Arctic circumpolar range and a south-ward pelagic migration in autumn. It visits our shores inautumn, sometimes in spring, and young birds have beenobserved in summer ; as a winter visitor it occurs at sea near thesouth coast. In the so-called skua-years many hundreds havebeen driven shoreward, and not a few picked up inland. Themost noticeable of
. The birds of the British Isles and their eggs . 2 //. II Buffons Skua. 5261. POMATORHINE SKUA. 261 Pomatorhine Skua. Sfercorarius pomarvms (Temm.). The Pomatorhine, Pomarine, or Twist-tailed Skua (Plate 115)is another skua with an Arctic circumpolar range and a south-ward pelagic migration in autumn. It visits our shores inautumn, sometimes in spring, and young birds have beenobserved in summer ; as a winter visitor it occurs at sea near thesouth coast. In the so-called skua-years many hundreds havebeen driven shoreward, and not a few picked up inland. Themost noticeable of these invasions were in the autumns of1879-1881, and were very marked upon the Yorkshire looked upon as irregular in its visits, it appears that thisand other species migrate normally at some distance from theland ; adverse conditions explain their appearance on the shore. The Pomatorhine is intermediate in size between the Great andArctic Skua, and, though it occasionally exhibits dimorphism, isusually of the same brown and whitis
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