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13

Aramides cajauea, June 22, 1960, III

uttered Trills when frightened. These Trills were accompanied by vigorous escape movements. Then it uttered chirps when handled. Finally, it uttered Trills when poked.

It is obvious that the vocal repertories of these chicks have changed surprisingly little since I first began to study them. The LC Notes don't seem to have declined any more during the last few days.

They still don't perform any ritualized postures or movements.

They still shake the head laterally when handled upside down or on their backs, but this doesn't seem to have developed any further.

All the calls are always uttered with the bill absolutely closed.

Aramides cajauea, I

June 24, 1960
Barro Colorado

The behavior of the birds doesn't seem to have changed at all yet.

I just ran tests on 2 birds this afternoon.

WH. Uttered chirps and then Peeps when handled. Then uttered Peeps when following me. Then uttered LC Notes when isolated, and Peeps as greeting. Finally uttered Trill's, both when poked and when frightened. All this was perfectly conventional.

U. Remained quite silent when handled. Then uttered a few Peeps while following me. Then uttered 1 chirp, followed by a few Peeps, when poked.  Then uttered 1 Peep when frightened. Surprisingly enough, it remained quite silent when isolated for quite a long time. Then it uttered 1 Peep as greeting.  Finally, it still remained quite silent when isolated again for a long time.

The fact that U uttered quite an appreciable number of Peeps during