Black-tailed Gull's primary wing-tip patterns

Variations of the primary wing-tip pattern of large gulls such as Vega Gull are various and it can be said that each individual is all different. However, this primary wing-tip pattern has a characteristic in each species and this is one of the important information to judge the species. A purpose of this site is to see the variety of variations of the primary wing-tip pattern of large gulls.

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Black-tailed Gull#3

  • Larus crassirostris : Scientific name
  • Imperial Palace moat Hibiya : Field
  • 2017/03/07 : Date
  • left wing : Sample wing
  • 100% : Confidence of ID


Third-summer plumage
Black-tailed Gull wing-tip pattern Black-tailed Gull Black-tailed Gull

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Black-tailed Gull#2

  • Larus crassirostris : Scientific name
  • Imperial Palace moat Hibiya : Field
  • 2016/03/08 : Date
  • right wing : Sample wing
  • 100% : Confidence of ID


Black-tailed Gull usually lacking mirror on P10. But this one has two mirrors on P10 each wing.
Black-tailed Gull wing-tip pattern Black-tailed Gull Black-tailed Gull

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Black-tailed Gull#1

  • Imperial Palace moat Hibiya : Field
  • 2015/12/18 : Date
  • right wing : Sample wing
  • 100% : Confidence of ID


Small white mirror on P10. This is in a minority.
Black-tailed Gull wing-tip pattern Black-tailed Gull 1512180382

To inform me about your opinions of this bird by leaving a message on the Gull individual page.

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