Example 1
IMG 7569

Carduelis spinus

(Siskin, Tarin des aulnes, Erlenzeisig, Lúgano común)

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9 Secondaries of the left wing

 

Feathers S9 S8 S7 S6 S5 S4 S3 S2 S1
Length (mm) 24 32 38 40 41 41 43 43 43

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