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 [image: DSTU2988 - GWGU copy.JPG] Jefferson County On Saturday, February 1, 2020 at 4:59:44 PM UTC-7, [email protected] 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 <[email protected] > <javascript:>> 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 > > > > -- > > You received this message because you are subscribed to the Google > Groups "Colorado Birds" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/cobirds/00F51F3E-FFA5-4FED-AC9E-EFB122B1116D%40comcast.net. > > > > -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/bc4643ab-c204-44ad-a68c-16bcfb2f4a92%40googlegroups.com.
