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47 Aramides cajauea, July 30, 1960 IX. like peeps or weak-sounding chirps. This would indicate that the chirps chirp-like notes are still (?) reactions. None of the notes was accompanied by ritualized postures or movements. All of them were uttered with the bill closed. We did notice one very interesting movement, however. By WH2, almost immediately (within a half hour) after hatching, while it was still very wet. At this stage, its little coccyx was quite conspicuous, and was repeatedly flicked upward . This may be the first form of ck. I couldn't determine the stimuli releasing these movements, or their function(s), if any, but the chick was trying to move around a little, probably trying to get more comfortable. (If the ck pattern is really present from the time of hatching, I may have overlooked it in the young chicks of the first clutch because the coccyx is obscurely down as soon as the down is dry until real feathers appear. When the WH2 chick first tried to lift its head after hatching, the head usually trembled (laterally) to a quite appreciable extent. This seemed to be eventually the same as the lateral quivering which used to be performed by the chicks of the first clutch struggling in my hand. Probably just an indication of intense muscular effort. Aramides cajauea, I. July 31, 1960 Barro Colorado The first chick hatched, WH2, seems to be flourishing this morning, but the premature one, WB2, seems to have rickets or something - can't keep its legs from sprawling sideways. The third egg hatched (normally) this morning at 7:25 a.m. I
