Example 2
IMG 4499

Larus ridibundus

(Black-headed Gull, Mouette rieuse, Lachm÷we, Gaviota reidora)

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4 Primaries and 6 secondaries of the right wing

 

Feather P4 P3 P2 P1   S1 S2 S3 S4 S5 S6
Length (mm) 161 146 132 122   113 111 110 109 108 112

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