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7

Aramides cajauea, June 18, 1960, III

I think that the bird we recorded yesterday when poked probably uttered both "chirp"s and Trll's. (I must check on this tomorrow). The few "AlCN"s which were uttered between LC Notes by the isolated bird we recorded were certainly "chirp"s. I think that the "AlCN"s uttered by all 4 birds yesterday morning when we first put them in their new cage included both "chirp"s and "Trll"s.

As far as the actual sound of all their calls is concerned,it would now seem that both the "chirp"s and the LC Notes are quite distinct - although the LC Notes & P Notes are rather similar in tonal quality. The P Notes and Trll's are very difficult to distinguish from one another in some cases. They would seem to intergrade with one another.

These facts would suggest the following. I. "Chirp"s are either distress and/or hostile (presumably largely escape).  Probably high intensity in either case. II. The LC Notes are certainly produced by frustration of some sore of gregarious or "infantile" motivation. III. The P Notes are probably produced by mild frustration of some gregarious or "infantile" drive; and/or (less probably) are mildly hostile. Rather unlikely to be distress note. IV. The Trll's may be produced by much the same motivation as the P Notes; but are obviously more strongly hostile. If both the P Notes and the Trll's are produced when some gregarious motivation is thwarted by hostility, then the hostile drives (escape predominant) are obviously stronger on the average, in the Trll's. It is also conceivable, however, that the Trll's are the direct result of activated hostility alone (i.e. gregarious motivation is "irrelevant" in their production). Like the P Notes, the Trll's are unlikely to be pure distress notes.

All the birds still seem to lack anything like threat or feeding or food begging calls.