All four are regularly seen in the UK, with two breeding. Skuas can be divided into two main types, the ‘great skua’ kind which are large, broad-winged and mottled brown and the rest, which are more slender, long-winged and have distinctive tail projections. These (including the Arctic skua) are unusual among birds as they appear in two or three plumage forms (‘dark’, ‘intermediate’ and ‘pale’).
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