Maclean 1964 C. fusciollis 15 July Flock of ca. 18 along top and W. side of gasoline ridge, flying actively. On E. side- 1 bison acting as if clicks near. 16 July Arthcal Maest - N. of Gasoline Ridge- flock of ca. 5 white-rumps + 7 pectorals. Joined temporarily by 2 iso-backs, 1 neo- phalascope. Flying and feeding as group. 2 white-rumps collected (Maclean 285, 289) - flock dispersed into 2 groups - pectorals separate. #285 - ca. 07. very light weight, molt processing. #289 - 20. P. molt just beginning - heavy on head, none elsewhere. Birds collected with 1 shot when flock standing up in 10 ft. circle. (i.e. - no doubt that these were flocking. In same area - bison distinct from flock, and remaining in 1 area, and giving alarm calls and distraction displays collected. (#284). Molt similar to #289 - but less on head. i.e.- least molt of all collected. Brood patches present and vascular. [I forgot to mention - #289- no brood patches present.] [illegible] Near parking area for gasoline ridge, and over polygonal area to North - flock of ca. 25 flying actively. Winds break into smaller flocks for 5 min +, then regroup. 3 birds collected.