I was at the Edmonds marsh Thursday afternoon before the thunderstorm moved in.? Heat waves rising from the mud made distance photography difficult.?

Tree swallows, sandpipers, and semipalmated plovers were present as well as a mystery bird.? My guess is a female yellow-headed blackbird, but I would like to hear from others.? Photos can be seen by scrolling down page 9 of this link.
http://www.pnwphotos.com/forum/showthread.php?14796-Wildlife-of-Edmonds-WA-2017/page9
Bill Anderson; Edmonds, WA. USA