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(?) major,(underlined), Mar. 2,1960, III 8

when handled. Hrr just uttered a few DN1's when handled, nothing when isolated.
  Ever since these birds have been able to walk, i.e. since the days they hatched, they have reacted to sudden loud sounds or unexpected movements by human beings by crouching motionless for a few seconds. This is the only fear response they have shown (aside from closing one or both eyes if a finger is brought to close to their faces.)

 (?) major,(underlined)I  March 3, 1960
                          Barro Colorado

  Both animals, and especially Hrr, have finally started to eat (?)and (?) this morning.
  We did a little testing and recording shortly after 7:00 a.m today.
  M uttered a few little bursts of DN2 when handled. Also a few,usually single, DN2's when isolated, when I called to it. (from when to it is underlined).
  Hrr uttered a few DN's when handled.  These were similar to the ordinary DN1's it has been uttering all the time, i.e. relatively low and hoarse, on the average, but I think that when it uttered a series of DN's this morning the individual notes were rather varied in pitch, i.e. (underlined) rather "bubbling," like the series of DN2's uttered by M. The series uttered by Hrr today may be,in fact the real "equivalent" of DN2's. Perhaps Hrr will never utter anything more like the DN2's of M. If so, there is little point in giving DN1 and DN2 different names.
  The difference between the DN patterns of Hrr and M (plus the fact that Hrr is now starting to gain more rapidly than M) might suggest that Hrr and M are of different sexes.
  There is no doubt but that these chicks are far less vocal than baby