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Mixed Diglossini, Apr. 5, 1963, III [[circled]] 23 [[/circled]]

bushes quite unconcernedly and silently, right in middle of area where Pect and Brun had fought. Quickly disappears.

8:15 Have finished writing up previous incident. Beginning observation again.

[[margin]] Pect Brun [[/margin]] Pect and Brun still singing, only 10 ft apart. Then see me, and each bird flies in different direction. Perch about 40 ft apart. Brun sings repeatedly. Pect silent. Then Pect begins singing, overlapping end of one Brun phrase. Then Brun falls silent Pect continues along time. Then shuts up. Then Brun sings again. In fact, 2 Bruns sing — not overlapping.

[[margin]] Pect Brun [[/margin]] So the huge overlapping of Brun & Pect songs was apparently only when their dispute was most intense and/or when the 2 birds were particularly close together. Probably not characteristic of more "relaxed" periods

Fog getting thicker 8:22. Difficult to see. Two Bruns singing quite frequently. Pect silent.

I am most surprised to find the Pect in this relatively open area

[[margin]] Pect Brun [[/margin]] One Brun utters one phrase which stimulates Pect to sing again Moderate overlap. Then both silent. Then same thing happens again. Brun stimulates Pect. Overlap. Then Pect sings alone

I think that the 2 Bruns here may be mates, defending their territory together against Pect.

Now Bruns singing alone.

[[margin]] Brun Gen [[/margin]] If the pair-bonds are stronger, on the average, among Bruns than among most related subspecies, this may be an adaptation to help them in inter-specific disputes!

[[margin]] Pect Brun [[/margin]] Again Brun stimulates Pect to sing. Again Pect continues a long time, while Brun utters several phrases at intervals.

There [[underlined]] seems [[/underlined]] to be only one Pect here.