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70

Atlapetes, Apr. 20, 1962, II.

ECN's of Yellow-throats, but not at all hoarse or buzzy

Then perches on twig about 15 ft away. In crouch. Making Bowing int. movs. Also lots of TF's. Few or (more probably) no WF's. At first utters series of "Tsit" Notes. Then silent. With extreme CR and Thflff throughout. Twice does a general shake-out of whole plumage. (It has been raining here recently - so these shakeouts may have been autochthonous.) Then flies to another perch about 10 ft farther away. Again perches in crouch, with Bowing int. movs., TF's, extreme CR and extreme Thflff. One more general shakeout of plumage. Quite silent. Then flies off and disappears.

This incident would suggest that ECN's are higher intensity than "Tsit" Notes, and that "Tsit" Notes are higher intensity than silent CR and Thflff. Probably all produced when escape stronger than attack.


Atlapetes, I
April 21, 1962
Cerro Punta

Working along upper edge llanos and ravine this morning.

At 6:00 a.m., there is an outburst of high thin songs which sound as if they might be uttered by Chestnut-capped Bush-finches. Phrases like "Ta-zee-zee ta-zeeeee-zeeeeee", "Ta-zee-zee zeeeooo" etc. Can't see the birds singing. Some apparently in shrubbery near ground. Others moderately high in trees.

These songs might also be by warblers. But I don't know which species.

Burst of songs over within 5 minutes.

6:25. Another burst of song. Absolutely similar in quality. Coming