Portland Bird Observatory
and Field Centre
Subalpine Warbler Sylvia cantillans
Portland Bill, April 30th 2004
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photos © Martin Cade
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Portland Bird Observatory
and Field Centre
Subalpine Warbler Sylvia cantillans
Portland Bill, April 30th 2004
Selected Biometry (measurements in mm; primaries numbered ascendently) Bill length (to skull) 13.8 Wing length (maximum chord) 65 Tail length 55 Tail/wing ratio (x100) 84.6 Wing-point P4 1st primary < 2nd primary 38 2nd primary < wing-tip 1.5 5th primary < wing-tip 3 6th primary < wing-tip 6 longest tertail < wing-tip 13 photos © Martin Cade