Ben, it is my sense that Herring x GW hybrids are more likely than Pure GW Gull in Colorado. This bird seems to have a lot of GWGU in it (for example, the white secondary skirt due to long secondary feathers), the for a pure GWGU in its second winter, I would expect paler primaries and a mostly dark bill. A retarded 3rd winter is another possibility. But, I think the best solution to this puzzle is 2nd winter hybrid (aka Cook Inlet Gull).
Interesting bird. Nick Komar Fort Collins CO > On Jan 10, 2019, at 4:59 PM, Ben S <[email protected]> wrote: > > Hi all - > > I saw this bird back on the evening of Tuesday, the 8th, sorry for the late > notice. At the time I had assumed it was an immature Herring or Thayer's > Gull. I am not good at IDing immature gulls, so I uploaded some pictures to a > Whatbird ID forum. To my suprise, a moderator responded that it could well be > a Glaucous-winged 2nd winter. This bird was on the ice with Ring-billed, > Herring, and a Thayer's Gull. Female Black Scoter was also present. Since it > is a rarity in Colorado, I was just hoping for a confirmation or rejection on > the Glaucous-winged ID before I enter it as such into ebird. Here are a > couple photos: > > > > <IMG_7604 - Edited (3).jpg> > > > > <IMG_7605 - Edited (5).jpg> > > > Also, here's a link to my ebird list, with more pictures of the possible > Glaucous-winged Gull, as well as some pretty good pics of the Black Scoter: > https://ebird.org/view/checklist/S51485423 > > > Ben Sampson > Centennial, 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]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/cobirds/9bf1f395-f303-46ac-a61b-a56772ef8e69%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > <IMG_7604 - Edited (3).jpg> > <IMG_7605 - Edited (5).jpg> -- 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 post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/21835B22-E326-4682-8A2C-F068DE9D5860%40comcast.net. For more options, visit https://groups.google.com/d/optout.
