After another look at the pics we took on Sunday the Sandpiper we saw was a Baird,s Sandpiper not a White Rumped Sandpiper . One of the best identification features is the long wings, which extend beyond the tail when the bird is on the ground. Only the White Rumped Sandpiper also shows this, and that bird can be distinguished by the feature from which it gets its name.
Their breeding habitat is the northern tundra from eastern Siberia to western Greenland. They nest on the ground, usually in dry locations with low vegetation.