2cy Thayer’s Gulls – 20140215

These first-cycle, second-calendar year Thayer’s Gulls Larus thayeri were seen during the Gull Frolic 2014, held on 15 February at Winthrop Harbor, Illinois, USA.

From a Western-European/Dutch point of view, it shouldn’t be too difficult to pick out such a bird from a flock of European Gulls (Herring or otherwise), right?

Some of the main identification features include:

  • 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

Bird #1

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

Bird #2

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

Winthrop Harbor, Illinois

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA. With first-cycle, second-calendar year American Herring Gulls.

15 February 2014, North Point Marina, Winthrop Harbor, Illinois, USA. With first-cycle, second-calendar year American Herring Gulls.

References

Gull Research – 2nd-calendar year Thayer’s Gull in February

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