Thayer's Gull (thayeri)

(last update: January 22, 2013)

Thayer's Gull 3rd cycle (4CY), 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).

Still looking immature, but note typical pattern on 3rd gen secondaries: grey centres with white tips).
Hardly any contrast between wings and scapulars, all adult-like grey, but some feathers with brown wash or delicate vermiculation. Few tertials with dark centres.
3rd gen flight feathers, still much black in tail and white tips on outer primary hardly developed.
Much black in bill.