RTH 1963 29 June Barrow, Alaska was such that the tail was in the vertical plane so that the white under tail-coverts. were very conspicuous from near. The bird then rotated from side to side wagging The elevated tail + folded wings. The bird did not turn more than 15-25° in the cup - so it kept its original orientation - (it as it turned out toward the & who was standing quietly 4' away). The rotation seemed to be done by pressing the breast into the bottom of the cup - The tail wagging was a consequence of this motion. After about 20 sec, the & arrived at cup, the & backed out, keeping the tail + folded wings at an above normal position - the lowered the wing tips into normal position (leaving the tail in a half- cocked way). Tail not spread. The & then stepped into the cup, turned completely, around 3 or 4 times, settled into the cup - manimal incubating posture & then after about 10 sec, she stepped out. During this performance for the &, the & stood at the side (near cup, just inches away from the &) and was in the posture shown above