Example 1
IMG 0328

Riparia riparia

(Sand Martin, Hirondelle de rivage, Uferschwalbe, Avión zapador)

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8 Secondaries of the left wing

 

Feather S8 S7 S6 S5 S4 S3 S2 S1
Length (mm) 33 40 42 43 42 45 45 45

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