Hollars, R. 1960 11 June Barrow, Alaska Erulia bairdii The pair were located in their approximate positions and others were heard N174As + east of the magnetic station. Several aerial encounters were observed where the intruder flew over the area of another bird, which immediately fold wing + displayed or chased the bird out. On one occasion Pair #2 were seen chasing bird #3. They landed near the nest cap + 8'2" went with a modified distraction display. The head went forward, his scapular were raised, and he then proceeded to choose the intruder for 2 feet from ground + then in the air. The flight looked for several hundred yards before the bird turned back towards the ridge. The aerial display of the Baird is as follows: The usual aerial note given on the wing is a continuous pree-pree-pree........... This is interrupted every few seconds by a trill which is rather musical (not harsh) and is regular in beat (notes evenly spaced). The trill does not drop into a whinny as the red-bird