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Tangara, Feb. 17, 1962, II                  

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perched close together. No TV or St. Didn't lead to anything. 

Tangara, I                      
February 21, 1962
Rio Piedras 

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Came upon a single Golden-mask at 8:00 a.m. Perched on top small tree. Aware of my presence, but not, apparently, too upset about it. The bird uttered R after R. Each R beginning somewhat gradually. Could these R's have been pairing?

Tangara, I                     
February 24, 1962
Rio Piedras

6:20 am. There is a presumed male Golden-mask here, flying from perch to perch, rapidly, in a very excited manner. Utters 1 or more R's at each perch. Continuing until approximately 6:50 am. Apparently alone all the time. Each R begins "gradually".

"Tuk tuk tuk tuktuktukkkkkkkkkk"

The preliminary "Tuk"s (or "Tuck"s) are usually or always lower pitched than the subsequent R's. Most of the R's are very long. The bird usually uttered these calls from very high and exposed perches. They are not accompanied by special postures or movements. Uttered from a great variety of unritualized standing and pre-flight postures. Not usually uttering in upright posture. 

Is this the equivalent of Dawn Calling?

Transcription Notes:
DAWN CALLING!! Looked it up. Dawn calling is correct! One sentence I saw said, "Dawn calling activity decreased as breeding season advanced." So, that makes sense. The first calls in the morning.