Figure 3.
First and second primaries Cantabrian gulls.
- Top: first feathers (P10).
- Bottom: second flight feathers (P9).
Data from:
Comparative study of four populations of Yellow-legged Gulls in Western Europe by Anne TEYSSEDRE
IN: L'Oiseau et R.F.O., V. 53, 1983, n° 1.
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