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Aramides cajauea, I.         

September 7, 1960 63
Barro Colorado

My pair of breeding birds just hatched a new clutch today! Three chicks. When I first saw them this afternoon, they were all 3 still in the nest, 2 quite dry,1 still slightly wet. I will make my notes on this third clutch. I am leaving these chicks with the parents. 

Aramides cajauea, I.         

September 10, 1960
Barro Colorado

WH2 has now been transferred to an outside cage, not far from the cage of the first clutch birds. When I first approach the cages this morning, WH2 runs away, in SC posture, uttering perfectly typical AlP's. Then stands still, uttering LC notes.

When I approach the cage of the first clutch birds, they all utter notes which are quite different, in sound, from any I have heard before. Moderately short, plaintive, melodious "Oooo" or Ooah" notes.  Without any new (new is underlined) specialized postures or movements (2 birds perform ck Movements while uttering their notes, but the other do not) I shall call these notes "OO." 

I seems probably that the OO notes are (?) descendants of the old P's.

Although the voices of these birds would appear to have changed very greatly in the last 2 or 3 weeks, this change seem to have been of a rather peculiar kind. Then voices seem to have "broken," i.e. changed in tone. This means that their vocal repertory sounds very different,