Thayer's Gull (thayeri)

(last update: January 22, 2013)

Thayer's Gull 2nd cycle (3CY), mid-January 2014, central California, US. Picture: Amar Ayyash.

Visit: Amar's blog for many more images!

Present flock of about >600 birds (170 1st cycles, 100 2nd cycles, 40 3rd cycles, 350 adults).

Bi-coloured bill, dark iris, and the legs are clean, deep pink.
Second gen flight feathers. The underside of the longest primary (P10) is visible: no sign of a mirror here (typical of Thayer's and unlike Kumlien's). Primaries are darkest part of the bird, dark brown, with neat fringes confined to the tip of each feather (but not well developed in this bird).
As is typical, the closed wing is predominantly brown and the tertials have solidly brown centres, and rather uniform mid brown greater coverts (but this bird more contrastingly patterned with vermiculation on tips of the upper tertials and outerwebs of the visible greater coverts).
This bird has no grey in the scapulars.