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Mixed Diglossini, Oct. 20, 1963, V. 
[[circled]] 16 [[/circled]]

As far as I can tell, they are both pure Carbo.

A few seconds later, I see what is obviously the A [[male symbol]] in what I presume to be B territory!!! But on the side toward the hedge. In Eucalypt. There is some flitting about, involving 2 or 3 birds Boundary dispute?

[[margin]] Carbo [[/margin]] If there are really 2 pairs of Carbos here, and I am really convinced that there are, then the TV pattern seen in the afternoon of October 16 (see p. 55 of notes on general mixed flocks) was performed by one of the B's (presumably the [[female symbol]]), [[underlined]] not [[/underlined]] the A [[female symbol]]. This is good evidence that TV patterns are characteristic of the population as a whole.

Leaving myself 7:00 am.

[[margin]] Carbo [[/margin]] Note about the A birds. They certainly showed fewer signs of sexual behavior today than yesterday. It is possible, in fact, that  their sexual behavior has been declining, irregularly, ever since I began to observe them. This might suggest that sexual behavior reaches its peak before nest-building begins in earnest. My observations of [[underlined]] baritula [[/underlined]] in Chiriqui would seem to support this. (It is also possible, however, that the birds were simply "depressed" today because it was cold & damp. Some of the other species in the area probably were less vocal today than yesterday - see today's notes on general mixed flocks).

[[margin]] Carbo [[/margin]] I presume that  the intruder with whom the A Carbo's have fought, from time to time, in their own territory, was one of the B pair. It is interesting that only one B seems to have intruded. The [[male symbol]]? Perhaps the [[female symbol]] takes less interest in the maintenance or enlargement of territory, at least at this phase of the breeding cycle?