Example 3
IMG 0091

Apus apus

(Swift, Martinet noir, Mauersegler, Vencejo común)

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9 Secondaries of the right wing

 

Feathers S1 S2 S3 S4 S5 S6 S7 S8 S9
Length (mm) 43 42 40 40 38 40 37 29 29

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