On the ground they are sluggish and not given to moving about much; unless very much harassed they are not nearly so vigilant as their companions, the black-bellied plover, but when they have become shy they are exceedingly wary and always on the alert for danger. When the incoming tide drives the knots from the flats they seek the marshes or some shoal which is sufficiently elevated to remain uncovered during high water; they also frequent the crest of the beaches. Here they generally remain quiet until the tide has fallen sufficiently to permit them to return again to the flats to feed. When on the marshes during high water they occupy some of the time in feeding, showing they are by no means dependent on the flats for all their food. They associate and mingle freely with the turnstone (_Arenaria interpres_), black-bellied plover (_Charadrius squatarola_), and red-backed sandpiper (_Tringa alpina pacifica_) as with their own kind, and apparently evince the same friendship toward the two former birds as prevails between the American golden plover (_Charadrius dominicus_) and the Eskimo curlew (_Numenius borealis_). I have heard of but one instance (at Revere, Mass., during a storm) of the knot being noted in the same flock with adult American golden plover. At this time there were three, one of which was shot. I have heard, however, of both adult and young knots mingling with young American golden plover, or "pale-bellies," as they are locally called. _Voice._--The same writer says: They make two notes. One is soft, of two articulations, and sounds like the word "Wah-quoit" (by which name it is sometimes known on Cape Cod); although uttered low, it can be heard quite a distance. This note is particularly noticeable when flocks are coming to the decoys; it has a faint rolling sound similar to the note of the American golden plover (_Charadrius dominicus_) under the same conditions, only more subdued and faint. The other is a single note resembling a little honk. These birds will also respond to the note of the black-bellied plover (_Charadrius squatarola_) as readily as to their own when it is given with a whistle. Roland C. Ross (1924) gives the following graphic description of the croaking note: