Warren Lake 3/1

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David Tønnessen

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Mar 1, 2020, 4:41:32 PM3/1/20
to Colorado Birds
Upon checking Warren Lake today 1-2:30 pm I found an adult Glaucous-winged Gull, presumably the same bird Nick Komar had this morning on another lake. The 1st cycle Glaucous Gull was present at least at the beginning of my stay, and the 1st cycle Great Black-backed Gull arrived around 2 but seemed to have disappeared shortly after. Among several 1st cycle Thayer's Gulls, one bird looked larger and good for a Cook Inlet (Herring x Glaucous-winged) but I did not see any young birds that looked like pure Glaucous-winged. I also tallied 7 Lesser Black-backed Gulls and 6 Thayer's Gulls.


Good birding,
David Tonnessen
Boulder, CO

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