Saturday 25 April 2015

[cobirds] Re: Jackson Lake gulls (Morgan Co.)

Lots of gulls (roughly 700) were still at Jackson Lake this morning (Saturday), feeding with the grebes and cormorants and then resting on the north side of the lake.  As I arrived, a large, very pale, dark-billed gull (first impression Glaucous-Winged or Glaucous-Winged x Herring, but I don't know) flew by, turned, and then was outta there.  Otherwise, I found 5 Lesser Black-backed Gulls, 1 first-year Thayer's Gull, Herring, California, Franklin's, Bonaparte's, and Ring-billed Gulls.  No sign of the Iceland Gull.

Although I didn't see a gull that looked quite like the candidate Western Gull from Monday, I've decided to leave Monday's gull as unidentified.  Observing gulls today was a good reminder at how difficult it is to observe the relevant characteristics at great distance for the breeding-plumage dark-mantled gulls.

David Dowell
Longmont, CO

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