Example 7
IMG 0311

Apus apus

(Swift, Martinet noir, Mauersegler, Vencejo común)

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10 Tail-feathers

 

Feather T5 T4 T3 T2 T1 T1 T2 T3 T4 T5
Length (mm) 84 74 63 54 50 49 54 62 72 83

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