This Wilson's warbler has flashing his wings for some reason.
Made for an interesting show.
They always make me think of someone with a bad toupee.
The Wilson's Warbler trends toward brighter, richer coloration from the eastern part of the range to the west. The Pacific coast populations have the brightest yellow, even orangish, foreheads and faces. Western-central and Alaskan birds are slightly larger than the eastern and Pacific coast populations.
source - Cornell Lab of Ornithology.