Calcarino 2 June Ptarmigan River, Cape Sabine, Alaska 1228 watched male drive away continually 3 other males from a female feed, and apparently not watching the proceedings. Actual body contact took place in 3 instances although most of the time the intruder retreated when flown at by the resident M. A threat note "spit" was given. No singing took place during these engagements. Interpret this to be early in the pair formation before the bond was firmly made and before nesting had started The results of these censuses seem to indicate that most of the clutches are now just completed and that Begg is the model clutch size. 4 June Found 2 nests, each with 5 eggs 5 June " 10 June A number of the nests had nearly hatched young in them today on Plot 1 13 June 5/7 nests now have young. 14 June Found nest on hill with recently hatched young. 19 June Found 2 nests 10/3, 4/5 both in alder willow 24 June Found first fledgling today 5 July Ptarmigan River, Cape Sabine, Alaska Common here but nowhere near as abundant as near the coast. Young quite advanced in growth—at least the tails are complete.