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(?)                Sept. 21, 1960, II.  70

and their bird gradually fell silent.
  We then took it into my house and let it run loose on the floor. It ran away immediately - silently. It went straight to a dark corner and crouched there, silent and motionless. This crouch did not appear to be ritualized in form (the head was not lowered as in XC). The bird remained quite silent and motionless when poked. Then ran away silently again. Crouched silently again. Ran away silently gain. Crouched. Ran. Again and again. Always the same.
  Then I picked it up again very gently (very and gently are underlined). This time it remained largely or (more probably) completely silent both when struggling and passive. (I did hear very faint "clicking" noises during some of these struggles. I (?) that these sounds were made by its toenails as it kicked.)
  Then, when I started to handle it a little more roughly again, it began to utter AlP's again.
  Then we let it back into its cage. It immediately ran over to join its parents and sibling. No greetings by anyone.

(?)    I.               September 24, 1960
                        Barro Colorado

  The young birds of the 3rd clutch were still uttering LC notes,loud and clear this morning.
  This afternoon we did a little experimenting with the birds around 2:30 p.m. 
  We started with the birds of the 3rd clutch. When we went into their cage to catch them, they ran away silently. When we finally caught one bird it uttered AlP's and/or chirps (probably both & intermediates). Then immediately fell silent and remained more or less passive in the hand(this was quite