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Cyanerpes, I 33
January 29, 1958
Barro Colorado

Well! Well! Well! I just realized that the youngest captive juvenile ♂ was singing this afternoon (He may well have been doing so for several days, at least, without my noticing it.) The utterance itself was a soft, rather prolonged, warbling sound, (not too unlike the WS of the wild Palui Tanagers or even the song of the young captive ♂ Yellow-bellied seed-eater, but lacking the distinctive notes, e.g. the "Sreeeee"s of the Palius, which are sometimes conspicuous in the songs of other birds).
Rather ventriloquial, in the sense that it was sometimes difficult to tell exactly where the sound was coming from. Uttered with the bill closed, or only opening & closing very slightly, with the throat visibly moving in and out (and possibly the wings vibrating a very little) in rhythm with the notes. Not associated with any particular ritualized movements or postures (not even [[fleebing?]]), with the possible exception of some preening movements (see below)
I think I shall call this "song" WS.
The circumstances of this WS were rather peculiar in some ways. When I first noticed the bird, he was spending most of his time flying actively back and forth from one end of the aviary to the other. Just pausing briefly between flights from time to time Sometimes he just landed and clung to the sides of the aviary, and uttered one or more WS's while he clung there. Sometimes he landed on a branch of a bush and uttered one or more WS's there. All these pauses were very brief. But he did