Re: [cobirds] Warren Lake gulls (Larimer)

I can share with you the evidence I found convincing. We were able to get clear photos of the solid black bill with white/very pale elsewhere. Joe Kipper was at Warren Lake when we were there Thursday and made the ID. Additionally, I have shared photos with Nick Komar who agrees they clearly show the GWGU.

Happy birding!

Donna Stumpp

Jefferson County

On Saturday, February 1, 2020 at 4:59:44 PM UTC-7, az...@aol.com wrote:

I am interested in chasing the gulls at Warren lake. It is a bit of a drive, so I am wondering if anyone is 100% confident with the slaty-backed and glaucous-winged identification?

I have noticed that some people are calling the bird good and some hybrids. Are these pure gulls?

I'll defer to the experts

Any help would be appreciated.

Thanks
Aaron Shipe
Jeffco

Sent from my iPhone

> On Jan 29, 2020, at 10:54 PM, Nicholas Komar <quet...@comcast.net> wrote:
>
> Warren Lake is currently a gull hotspot, due to large fish population with a large flock of common mergansers and common Goldeneye bringing fish to the surface. Furthermore, there seems to be many dead fish frozen in the ice sheet at the west end. The smorgasbord is attracting 500-600 gulls present throughout the day.  The area is private. However birders are welcome at the lake. Just use common sense. Stay off residential properties.
>
> Gull numbers are as follows:
> Ring-billed Gull - 500 (99% adult)
> Herring Gull - 20 (40% adult)
> Iceland (Thayer's) Gull - 10-15 (10% adult)
> Lesser Black-backed Gull- 6-10 (40% adult)
> Glaucous Gull -1 immature
> Great Black-backed Gull-1 immature
> Mystery gulls-10 or so.
>
> The mystery gulls are mostly immature gulls that are
> somewhat atypical. Most of these are probably Herring Gull hybrids such as "Nelson's" Gull (with Glaucous) and "Cook Inlet" Gull (with Glaucous-winged). Today there were two first-Year large gulls that resembled Glaucous-winged and one that resembled Slaty-backed. Better photos are needed to confirm these.
>
> Nick Komar
> Fort Collins CO
>
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