Holmes, R. 1964 C. bairdii 11 June Barrow, Alaska Bird displayed low (15') with flappy flight, then gliding on down-curved, non-beating wing - gave brief + linedel - keeping wing up near vertical + then raised tail to 90°, gave a 3 sec brief lateral wing (which had been merged) + then round the right (the right was put out first - before the other was lifted) - each in (in about 4 sec) - tail still arched - the bird in a hurrated posture but head was up. When 50 flew as in display, the bird raised both wings to vertical + gave rapid tail notes - the lower left wing sank to resting position. Late 5 birds involved in a chase, moved high (180-190') closely together - 10' apart at most - 2 moved off together - both - flapping, low display - another the pulled off + displayed - while the 2 remaining went out 1 left. Tentand boundaries seem indistinct at this stage - at least when chase begins. They all join in + cross boundaries, cutting together - finally to move off. Whether or not only 5 were involved - the precenten; all birds involved seemed to have.