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2

Rhamphocelus, Jan. 13, 1958, II

and the angle of the body, before the TF. A single T was usually a single jerk to one side. There was usually a pause before the tail was jerked back to center or jerked to the opposite side (this second movement should probably be considered a second TF)

This [[male symbol]] in his cage spent most of the day with his tail very widely fanned (Fnn); both during TF's and when the tail was still.

His tail often trembled (Tbl) for minutes at a time a very slight fast vibration. Only visible, at least, when the tail was otherwise still.

He also did a lot of WF. Often synchronized with the TF's, but usually less frequent.

He also did a lot of CN-ing, the notes increasing in frequency whenever he became particularly alarmed and moved about more than usual (with more flicking).

Rhamphocelus, I
January 20, 1958
Barro Colorado

I watched an apparent pair of Sangre de Toros near Pedro Miguel Lake a couple of days. Feeding along tree-tops, often quite far apart from one another. Noticed they gave quite a lot of ordinary CN's. The captive [[male symbol]] here also gives quite a lot of these from time to time. This seems to be one of the species with a comparatively common CN, presumable with a low releasing threshold - in spite of the fact that it doesn't seem to be really gregarious.