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Mixed Diglossini, Aug.22, 1965,VI 112 

[[left margin]] Laf 53 [[/left margin]]
Laf continues Singing for some minutes. Then attacks and chases another Laf in nearby bush. Attack & chase silent.

[[left margin]] Laf  Coer [[/left margin]]
While this Laf was Singing, I thought I also heard some Coer phrases, completely overlapped by the Laf. (Difficult to be sure about this, as Laf voice is much stronger than that of Coer.) But then, after the Lafs fly off in chase, I definitely do hear some ( more) Songs by presumed Coer. (The bird is invisible; but all its phrases include “Seeeee” Intro Notes.) Now presumed Coer is NODWA.
 
[[left margin]] Coer  Humer [[/left margin]]
Presumed Coer continues to utter phrases at irregular intervals. Then presumed Humer starts to utter phrases. The two birds alternate. No overlaps.

[[left margin]] Laf  Coer [[/left margin]]
Incidentally, the Laf(s) and presumed Coer here definitely cannot be the same two individuals heard overlapping up hill earlier this morning. So the absence of song inhibition between Lafs and Coers here probably is a general phenomenon!!!

8:30 am. More Humer Songs. NODWA.

[[left margin]] Gen [/left margin]]
It really is very remarkable that a Humer-Coer mutual Song inhibition seems to exist here when there is no Laf-Coer inhibition!!!

[[left margin]] Laf 55 [/left margin]]
8:36. Somewhat farther along road. (Again) see one Laf ✓ repeatedly supplant and chase another ✓. Silent. But the more aggressive bird at least once stood with belly fluffed, while perched, between chases. 

[[image]] Side-view of bird [[/image]]

It also did some slight, irregular, bowing and pivoting. These movements themselves appeared to be unritualized in form. But they may