Hamilton 1965 Somateria mollissima June 13 Barrow Alaska - A flock of about 75 of these birds was observed flying N over the tundra at the W side of Family Lagoon. They flew about 5 yds. above the tundra and their field marks were easy to see. The flock was, about 80% males. July 12 A flock of 300 was observed July 16 - Aug. 27 - Eiders were frequently seen flying N along Elson Lagoon. This generally occurred with a following wind. Generally they flew in flocks almost exclusively composed of one species. The King Eiders outnumbered the Common Eider about 5:1. Before the 3rd of August 15, flocks were made up almost exclusively at M.I., After I got back from Lap Thompson, Aug. 15, they were made up almost exclusively of females or at least birds in female plumage.