Lesser Black-backed Gull Green YBJB primary pattern update – 2020

Images of adult Lesser Black-backed Gull from our Dutch IJmuiden Forteiland project ringed as YBJB showing the primary pattern in 2020:

  • Left wing: black on 8 primaries (no black on P1 and P2)
  • Right wing: black on 9 primaries (no black on P2)

I have never seen that a primary pattern is ‘skipped’ as it is in P2 in the right wing.

(Click the images for a larger view)

YBJB-11-May-2020-IJmuiden-Forteiland-Maarten-van-Kleinwee-1

This pattern is again different from the previous 3 seasons:

  • 2017: Black on all 10 primaries
  • 2018: Black on 8 primaries (no black on P1 and P2)
  • 2019: Black on all 10 primaries

2017:

YBJB-8-May-2017-IJmuiden-Forteiland-Maarten-van-Kleinwee-3

2018:

YBJB-14-May-2018-IJmuiden-Forteiland-Maarten-van-Kleinwee-1

2019:

YBJB-29-April-2019-IJmuiden-Maarten-van-Kleinwee-1

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