Example 11
IMG 4658

Larus ridibundus

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

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2 Primaries, 2 secondaries, and 2 great coverts

 

Feather Pa Pb Sa Sb   PCa PCb
Length (mm) 142 120 107 107   97 90

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