Gilmore DUCK HAWK (?) 1931 Sept. 19 Unalaska, Unalaska Is., Aleutian Is. Over the peaks east of Cascade Falls about 4 miles S.E. of town I have repeatedly seen a large falcon hawk, and today I made an unsuccessful attempt to get one. One almost came within range as I was climbing a rocky steep shoulder of the peak but it was the closest any came. While I was lying on the steep slope, a pair flew rapidly westward & high above my head uttering a high pitched frenzied trilling cry. It was very distinctive but I have never heard it before. These hawks (perhaps they are Gyrfalcons) poor flap for hours about the high peaks & rock cliffs and seem to resent the intrusion of a raven or eagle. They promptly drive the raven away and annoy the eagle considerably. I have never seen one perched or sitting on the rocks or ground. Sept. 22 Unalaska. I saw one about the high sea cliffs between town & Summers' Bay today.