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(?)                  Oct. 29, 1960, II  77

lts I have had. 2 phases. Not accompanied by an y very distinctive ritualized postures of any sort. Neck just stretched upward. Head possibly inclined a little upward. All 4 birds did the Trumpeting simultaneously (although their phases were not exactly synchronized). The whole outburst was apparently provoked by the sight of the 2nd clutch bird walking by, about 10 feet away, very quietly and inconspicuously. So the trumpeting may be hostile. The 2nd clutch bird didn't respond in any way.
  The birds of the 1st clutch still utter 00 notes when I appear.

 (?)                  November 21, 1960
                      Barro Colorado

  We have kept catching and testing the birds of the 3rd clutch every other day (approximately), on Oct. 30, Nov, 2,4,6,9,12,16,and 19,with no result. Both birds always silent throughout, both when chased and handled.
  They are both quite full-grown now, but their flesh colors are still very immature (their upper mandibles are beginning to turn yellow).
  Whenever we chase the birds of the third clutch, the birds of the first clutch (which are in a cage about 10 ft away) always become greatly excited. Running about and uttering loud clucks.
  On November 2, I noticed that at least one bird of the first clutch was also uttering another sound, in addition to (?) while we chased the birds of the third clutch. A series of very low (very and low underlined), muffled, rather prolonged "Ooooooooou, Ooooooooooooouh, Oooooooouh...." sounds. Much (underlined) lower and longer than the 00 notes. I shall call these "Booms." They are quite reminiscent of some of the notes of the male Pavo.