Lesser Black-backed Gull (graellsii & intermedius)

(last update: May 17 2015)

LBBG 1cy: Data sheets, May 2004, Missouriweg - Maasvlakte, the Netherlands.

We developed data sheet for this survey. Measurements of volume after Harris (1964): V in cm3. V = 0.476*length*width2.

The measurements for the pulli of group I:

• Total leg -/- nail. Using vernier callipers readings to 0.1 mm: from feathering to stretched mid-toe -/- nail.
• Head + bill. Vernier callipers readings to 0.1 mm: bill-tip to back-head bump.
• Weight. Place bird in bag attached to unster. Readings to 1 gram.
• Hand span. Ruler readings to 1 mm, measurements from chick age = day 05.
• Sequence of wing-covert growth. Unfold wing and photograph scapulars, wing-coverts and tertials. Use designed forms to note location of unusual patterned wing-coverts or scapulars.