They finally alighted on a steeply sloping rock close to the water's edge on the northeastern point of the island so that they could be watched with binoculars and telescope from the shore. Fifty-eight birds were in sight and there were fully half as many more on the other side of the rock, hidden from view, except when they jumped up from time to time. The flock must have numbered 75. The tide was high and the birds were evidently trying to kill time until low water, when they could gather their food from the seaweed covered rocks. Most of them were resting, squatting on the rock with head to the wind, their dark purplish-gray backs contrasting strongly with their white bellies. Others were slowly raising their wings over their backs, showing the white under surfaces. Again they were chasing each other, making the sleepy ones jump suddenly, or running up the rock to escape an unusually high wave, fluttering with their wings to help themselves. From time to time they were joined by bunches of from 5 to 10 others.
_Voice._--This species is a rather silent bird, but John T. Nichols says in his notes: "When about to take wing a flock of purple sandpipers is rather noisy, keeping up a swallowlike chatter, each single-syllabled note suggestive of the _flip_ of the tree swallow and of the _kip_ of the sanderling."
_Field marks._--A sandpiper seen on a rocky shore in New England in winter is likely to be a purple sandpiper. Mr. Nichols suggests the following field characters:
The purple sandpiper is a stockily built bird, which stands low and has a moderately long bill. Its breast and upper parts of a dark purplish gray match admirably the rocks on which it lives, and although darker are not very different in tone from the coloring of the red-backed sandpiper in fall, with which species it might possibly be confused. Both have a white line in the wing shown in flight, but in the purple sandpiper this broadens to a more conspicuous wedge of white backward on the inner secondaries and extends across the bases of the primaries as narrow edging to their coverts, rather than turning the bend of the wing into the primaries. The best field character is the color of legs and feet, which are of a dull but strong yellow, appreciable at a considerable distance. The basal third of the bill is of the same, but tinged with orange.