A Glaucous Gull (Larus hyperboreus) was found at the Bryan Stock Trail Pond in Casper, WY today (11/13/2019). See more thoughts on this "Pale Larry" below.
I called this bird a 3rd year or 3rd winter bird in the field due to the lack of brown smudginess. This was no "Dirty Larry." This Larry was clean, though the photo quality almost gives an appearance of brown smudges. The bill was pinkish (it had a hint of yellow) with a black tip, and the scaps/coverts are almost all adult-like. I could easily be convinced of a 2nd winter bird with a better view than I had at the time. If you are interested in learning about identifying two common gulls in our region, read about the Larry Conundrum HERE!
Here is typical the range for the Glaucous Gull: