Thayer's Gull (thayeri)

(last update: January 22, 2013)

Thayer's Gull 1st cycle (2CY), February 15 2014, North Point Marina, Winthrop Harbor, IL. Picture: Maarten van Kleinwee.

Visit: Maarten's blog for many more images!

• Uniformly coloured, pale-brown plumage (including chest and head) with little contrast (paler than a European Herring Gull but darker than an Iceland Gull or Glaucous Gull of the same age)
• Dark-brown outer primaries with light crescent tips
• Juvenile scapulars
• All-black bill
• Almost fully dark tail
• Pale window on inner primaries
• Heavy, dense barring on uppertail and undertail coverts

Note the broken tips of primaries P9 and P10 in the right wing and the light spots on the central tail feathers.