|Arctic Jaeger Stercorarius parasiticus
(aka Arctic Skua, Parasitic Jaeger / Skua)
Collins Bird Guide says: "The successful identification of Jaegers in the field requires a lot of practice." Despite my relative lack of knowledge of Jaegers to begin with, I concluded that the first 3 photos were of a juvenile Arctic Jaeger. It is a bit like a dark gull but also looks a bit like a falcon. There are white panels on the wings which are more obvious on the underside than above.
|Arctic Jaegers breed in the Arctic and sub-arctic areas of Eurasia and North America including northern Scotland, Scandinavia and Iceland. They start to migrate south from August onwards and winter off the coasts of South America, southern Africa and Australasia. Adults arrive back in Scottish colonies in late April.
During the breeding season, they feed on birds, small mammals, berries and insects. Outside the breeding season they obtain food by piracy, chasing birds such as terns and gulls until they drop whatever they are eating. The third photograph shows a skua chasing what I believe is a sub-adult Herring Gull.
|There are two principal adult plumages: the dark morph seen in photos 4 and 5; and the light morph seen in photos 6 and 7. The dark morph birds decrease relative to the light morph birds as one moves northwards. There are illustrations in HBW, Volume 3, Pages 557, 564, 567 and 568.|