Janich 1953 Stercorarius pomarinus July 26 Point Barrow, Alaska interrupted this activity to drive off intruding jaegers that passed through. July 28 This evening I noted 20 to 30 jaegers in flight, milling about on Brant Point, from Birnib. There were frequent flights on me or two back and forth to sea, over the spit. July 29 Going to the marshy flats at Brant Point this afternoon I found 24 jaegers on the ground at one place. I went there and the birds dispersed. At the place were concentrated abundant activity of lemmings that had broken-roofed runs in the mossy surface, over an area about 50' wide. The jaegers had thoroughly worked the area so that sod tufts picked from the run- way roofs lay scattered everywhere and the burrow system was thoroughly opened up. Stretches of the habitat of that area had no lemming sign. Apparently the abundance of lemmings at this spot attracted many jaegers. After the birds dispersed I counted 49 flying about or perched on the tundra within the terri- tory about 1/2 mile across, around me. Some of these may have been birds in charge of their young, but I saw no