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[[circle]] 229 [[/circle]] [[underline]] skua chilensis [[/underline]], Jan. 3, 1956, II. er then). Unfortunately, I couldn't tell which birds were giving the call, (their must have been 50-100 all flying around rapidly usually high in the air), and I don't know what postures & movements, if any, accompanied the call. I saw all sorts of violent aerial hostility in this group of birds. Rapid, [[?]] chases; aerial fights; fast, long, rather shallow swoops; a few gliding soars; a lot of flying soars, etc. etc. We were dive bombed (ie. charged and/or swooped at) repeatedly by the enraged parents, (who rose again each time with a flying soar). The interesting thing about these attacks is that [[underline]] all were silent. The same thing is true of all the intraspecific attacks I saw.[[/underline]] This is most unexpected. We picked up 2 chicks in our hands. One was at least several days old, the other was at least a week old. Both gaped & lunged; but were absolutely silent. Like some old Franklin's Gull chicks, after being held in hand a while. Quite in contrast to a young Kelp Gull (about a week old) which we also picked up today, and which gaped, lunged, & screamed [[jiw.?]] rattle "LCN" at us simultaneously. January 2, 1956, Porvenir Bay. [[underline]] maculipennis [[/underline]] A few notes on stuff I have almost forgotten: A bird flying around in air, uttering LCN's, moderately long, moderately close together; but the bird was definitely giving them from [[underline]] an extreme O [[/underline]] posture. In other words, in this species, the extreme aerial O posture of this species seems to have become definitely associated with a vocalization which is low intensity in other species This, and the fact that I have seen all sorts of apparently high intensity aerial hostile behavior without L.C., is beginning to make me think [[end page]]