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(?)major, (underlined)Mar. 17, 1960 I   16

  Hrr didn't utter a sound, either when isolated or touched on the back by me.
  Muttered a few brief series of DN2"s, both when isolated and when touched on the back. No more than 3 or 4 notes in a series.

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

  Arrived back here on April 1. The chicks are much larger now and appear to be flourishing. Almost completely feathered except for their head and necks.
  According to Jack & Arleen, the chicks were silent all the time I was away. They are certainly almost completely silent now. We have not yet been able to provoke any sound from either of them by handling them (or touching them on the back) or by isolating them.
  The only sounds I have heard either bird utter since my return occurred on the night of April 1st. Hrr was trying to snuggle under M, presumably in preparation to go to sleep. During this process, one or both of the bird (I think (underlined) only Hrr)uttered a whole series of DN's. Their sounds very much like the DN's uttered before I left - but rather more "adult." I think they were both lower in pitch & "clearer" than the DN1's Hrr used to utter.
  Both birds fly very willingly - rather to my surprise. Both are still fixated on human beings. They will run after a human being (at least David and me) walking away from them. If the human being walks away rapidly they will fly after him. If I sit quietly, M will fly up and try to land on my face, head, or shoulders. Once she is nicely perched on my head or shoulders, she will sit there indefinitely, apparen