Holmes, R. 1960 30 June Skroalik, Alaska During The evening hours, several white - rumped Sdp. were noted near stake 22.4-25.4. When first seen, one bird was flying low over the ground. He landed suddenly and kept his wings at a 60° with the ground. His tail was raised but The tail feathers were not spread. He then proceeded to move slowly with a very slight tside to side motion. The 'porging' was also. I could not ascertain if this was toward a ? or not. Several seconds later, I saw 2 white-rumps chasing a third bird in a zig zag fashion. About one hour later, another chase was observed which again involved three birds. Two appeared to be chasing the third as they flew low over the ground. This chase lasted nearly 5 minutes before the birds disappeared into the fog. About 15 minutes later, a displaying bird was seen ahead near stake 24.5. When The bird glide down after