Arctic skua – Stercorarius parasiticus
The parasitic jaeger (Stercorarius parasiticus), also known as the Arctic skua or parasitic skua, is a seabird in the skua family Stercorariidae. Identification is complicated by similarities to long-tailed jaeger and pomarine skua, and the existence of three colour morphs. Small for a skua, the parasitic jaeger measures 41–48 cm (16–19 in) in length, 107–125 cm (42–49 in) in wingspan and weighs 300–650 g (0.66–1.43 lb). The tail streamer of the breeding adult accounts for about 7 cm (2.8 in) of their length. Light-morph adults have a brown back, mainly white underparts and dark primary wing feathers with a white “flash”.

This is the sound of a skua
Recording by Lauri Hallikainen from Xeno-canto