WArren and I watched these 2 birds for 2 afternoons finally I decided to get a photo and then see what they were. It seem you think you know all there is toknow and then out comes the Bird book and wow there are so many birds and little markings it is a challenge. but I narrowed it down to Barred or Marbled Godwit but nesting of Barred is in Alaska so this is my final answer.