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(?) major, (underlined)March 8,1960, II 12

may also have been due to hunger, as the animal had not been fed for quite a while). If their DN2's were the result of frustrated gregariousness or infantile motivation, this would suggest that the DN2's have "replaced" the LN's. If so, it is most peculiar.

(?) major,(underlined)I    March 9, 1960
                          Barro Colorado

  We tested and tried to record the 2 birds in the usual way this morning. Nothing new in the way of behavior. M uttered DN2's when touched on the back, and Hrr uttered DN1's when touched on the back. Hrr uttered very few notes in such circumstances, while M uttered a lot - long series of (?) notes. It is possible that M utters more DN2's under their circumstances now than somewhat earlier.

(?) major, (underlined)I  March 13, 1960

  Both M and Hrr seem to be doing pretty well -although M is certainly (?) more than Hrr. (Hrr is just getting over its (?).  Both have well-developed wings now. (Tonight M flew nearly vertically five feet into the air to get out of the box in which I was testing it.)
  I only observed the birds tonight, around 7:30-8:30 p.m.
  M seems to be just about as vocal as before (which is not very much). M tried to cuddle under Hrr when it got sleepy tonight. This did not work out well, and M seemed to be very dissatisfied. It uttered several bursts of DN2's (which sounded just as on previous