Holmes, R 1963 29 June Barrow, Alaska While churring, the posture is such that the bird is tilted slightly upwards the head is held [illegible] even higher, tail is spread partially. In quivering - the bird is actually hovering. But usually progresses forward & upward slowly. At times, he may move considerable distance (he covers an area / several acres) for about 3-5 minutes. The bird at spirals up but usually faces into the wind when in one position for any length of time. This churring posture is then interrupted by periods when a loud, descending trill is given. At these times, the bird sets its wings above a horizontal plane , glides down gently for 3-5 sec - giving the trill. It may then go out to pound a flap several times, gaining altitude & then resume the quivering wing display. In the downglide - the black belt, belly is more conspicuous in the bird been put forward, head & wings up & the black belt is most impressive. The throat further accentuated by the contrast with the white under