These birds only show up in DFW during shorebird migration which takes place in May, then again in July. I was thrilled to find a small flock of them at the spillway. The best way to identify this species is to get a good look at the bill. It will be dark but have a bit of red showing at the bottom base of the bill. With dark legs. I was lucky they were close enough for me to get shots that showed that field mark.
White-rumped Sandpiper (Calidris fuscicollis)