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(?)           September 17, 1960, III   73

  Then we went to the cage of the chicks of the 3rd brood. Both ran silently when chased. Finally managed to cover one. It uttered AlP chirp's. Then when we caught it, it remained silent. Silent and passive in the hand.
  The parents of these chicks,incidentally, uttered single clucks, at fairly long intervals, when we were chasing the chicks. (I shall work the behavior of adults with (?).

(?)               September 29, 1960
                  Barro Colorado

  Did a little work with the chicks of the 3rd clutch again today. Both silent when chased at first. Both uttered AlP-chirps when covered. Also when finally caught. (I think their sounds should probably be classified as particularly high-pitched "urgent" chirps.) Both quite silent when more or less quiet in the hand. No sign of clucks yet.
  When we let the second chick go, it ran away with AlP-chirps. There declined in frequency quite rapidly. But the chick still uttered single notes for at least 15 minutes after being let go. By this time the notes had declined to ordinary P's (perhaps AlP-P's).
  I heard at least one of the chicks utter typical LC notes this morning.
  
(?)           I.        October 2, 1960
                        Barro Colorado

  Tried the usual experiments with the 2 chicks of the 3rd clutch this morning 9:30 a.m. No change in their behavior yet. Gave AlP-chirps when covered and when caught. Then AlP-chirps when struggling in the