Immature skuas

In many long-distant migrants, immature birds arrive later than adults. This seems to be the case in Long-tailed Skuas as well. In Ammarnäs, I have seen them mostly from mid June onwards. During the last few days, we observed some immature Long-tailed Skuas in the Raurejaure and Björkfjället areas. They showed a wide range of plumage characters, but all fit the 3rd calendar-year plumage type. We were hoping to find one wearing a nice green colour-ring, but none of them did. That would be a first: as far as I know, no documentation exists of immature Long-tailed Skuas of known age… As 2011 was the best breeding year in ages and I colour-ringed quite a few chicks that year, this year is the ultimate year to find an immature with a ring… So hopefully this post will get a sequel soon…

A nice 3rd cy Long-tailed Skua in Björkfjället two days ago. At exactly the same spot we observed two different immatures today in a flock of 20 skuas.
A nice 3rd cy Long-tailed Skua in Björkfjället two days ago. Note the barred underwings, short projection of central tailfeathers and the adult-type dark cap. At exactly the same spot we observed two different immatures today in a flock of 20 skuas. (Vincent Hin)
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