The plumage of this indivisual is somewhere between 3rd and 4th calendary year. I suggest the individual to be considered as a retarded (in appearence) 4th calendary year but in my opinion it's tricky to tell for sure why its' not a 3rd. The P10 mirror exists but it's not very consistent, the tail, secondary and covert pattern is also somewhere inbetween both plumages.
Another nice individual with many black on secondaries
4th cy Yellow-legged gull (L. michahellis), 07-06-09
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