396 Gilmore MARLE QUIN DUCK (3) 1931 the beach water and when I fired the rest took wing from behind the rock. This is the first time I have seen these birds sitting on the rocks, out of the water. Oct. 7 English Bay, N. Unalaska Is. Harlequin Ducks are [illegible] numerous here and hard to approach. I noted about 200 in all and the majority were in flocks of from 15-30 and frequented the smooth water next to the rocky beach. Capt. Henry Swanson states that he believes these birds nest in sea caves attainable accessible only by diving under the surface. He has seen birds dive in front of a rocky cliff and never come up. Off the rock cliff of Cape Makushin he watched this phenomena happen to a flock of a dozen or so birds. In all his hunting around the Aleutian Is. he has never seen a nest, but he has seen downy young with the mother, in the water off the rocky beaches.