At first, I was thinking Bewick's also.. although it's pale underneath, the tail doesn't appear to be very long, and the bill seem to be too curved for Bewick's.
This was taken today around 5pm looking into the sun. The bird in the foreground I believe is a Semipalmated Sandpiper. Is the one in the background a Baird's Sandpiper?
Thanks for your help.
Thanks Todd. This bird looks more like your bird(s). I have only seen Prothonotary in spring time in Canada, so wasn't familiar with juvenile/immature.