Gull Research Organisation

Thayer's Gull (thayeri)

(last update: January 22, 2013)

Coordinators:
Amar Ayyash (USA)
Mars Muusse (Netherlands)

thayers 1cy August
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thayers 3cy December

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Thayer's Gull - Plate 2b.

From: Identification and Variation of Winter Adult Thayer’s Gulls with Comments on Taxonomy, by Steve N.G. Howell & Martin T. Elliott, IN: Alula 4/2001.

Plate 2b. Wing-tip scoring criteria for P5 patterns.

Score 3: complete black subterminal band.
Score 2: incomplete subterminal bands.
Score 1: dark spots or marks.
Score 0 = unmarked. Note that score relates to extent (not tone) of dark marks.