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(?) major (underlined)I  March 8, 1960  11
                         Barro Colorado

  The birds seem to be much the same today as yesterday. Hrr is (?) limping, but apparently no worse.
  We tested both animals again today, putting them in a box to record.  No sign of any LN by either bird.
  They still uttered DN's when handled, however. DN2's by M, DN1's by Hrr. Single notes, or doublets, or triplets, or series of four or five notes (possibly six or seven in some cases). It was my impression that the series of DN2's uttered by M tended to be longer, on the average than the series of DN1's uttered by Hrr, but there was probably complete overlaps.
  Note!! (underlined) When I say that their birds uttered notes when "handled", this means that they uttered these notes when they were touched on the back (when their feet were still on the ground). They do not (underlined) utter any kind of notes when actually lifted up off the ground and held in the hand. This has been true since the second or third day after hatching. Presumably strong activation of hostility (either the attack and escape drives or the escape drive alone) inhibits both the DN1's and DN2's )and I still think that Hrr's DN1's are the exact equivalent of M's DN2's,now).
  I would say that the DN's uttered by both birds are purely hostile now - except for one peculiar incident.  David says that when he returned to the box, after leaving M alone for a while, it uttered a series of DN2's exactly like the ones it utters when touched on the back, although he did not attempt to touch it. Their DN2's may have been "greeting," or due to some thwarted gregarious or infantile drive. (They