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Aramides cajauea, June 30, 1960, II

Then U uttered Trills when poked, and also when frightened. In both cases, the Trills were very much like Peep Notes, with only a very slight, initial, trilling quality comme ca"

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These reactions by U would certainly suggest that the vocal repertories of these birds are just about ready to change. The trills would seem to be becoming less differentiated. More important, the Peep Notes may be developing into several different kinds of patterns.

I think that the relatively long Peeps uttered by U when isolated and as greeting were longer than the usual Peeps uttered by the 4 birds a few days ago. And the "alarm Peeps" are certainly quite distinct morphologically.

WH. Utters Peeps and then 1 chirp when handled. Then utters rather short Peeps when running away from me. Then remains silent for a long time when isolated. The utters a few LC Notes as isolation continues. Then tries to jump out, repeatedly. The LC notes stop as soon as jumping begins. Then utters single, more or less undistinguished "medium" Peeps as greeting.

Then utters moderately short and moderately rapid Peeps, both when following me and when running away from me.

Then utters the same type of Peeps when frightened.

Then utters perfectly typical Trills when poked.

This bird may be somewhat retarded??? Not only can it utter perfectly typical Trills, but it also showed a definite tendency to follow me very well and closely from time to time. This might conceivably explain when its Peeps seem to be [[?]] "differentiated" into different patterns than those of U.