1963 Green Is; Kure Atoll, Hawaii, Pacific Ocean R.Clapp Dec. 17. [Questions about red-tail display - In group of four ; is display to particular bird or any bird? Is there any general behavior sequence following display? How do number of displays within a given unit of time vary with time of year & stage of breeding cycle? What happens when all four birds come close together? How long does a "complete" display take? For In terms of time ; which is more variable the arc-flight or the hovering? ]