1. Cade 1959 Stercorarius pomarinus 22 May Pitmgea River - 1445 - flushed 20 seen congregating about a Knoll on the high ridge north of the river and upstream 1/4 mile or so from camp. Birds came down in a strong wind. 23 May Pitmgea River - in the morning a straggling flock of 11 followed by two had been flying down the coast in the vicinity of the study area. No other flocks seen. By late afternoon single jaguars were seen coarsing about at various quarters all over the environs of the camp and the "announcement" call was heard at two different stations near Chileli's study area back of camp. Very rapid dispersal of the flocks. 4 May Pitmgea - no flocks - singles seen hovering over the tundra in all quarters. 5 May Pitmgea - birds still scattered over tundra - several apparently associated such as pairs. Some incipient chasing and displaying noted, but organization still pretty,