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[[Circled]] 19 [/Circled]]
Mixed Diglossini, Oct. 23, 1962, IV

[[left margin]] Laf [[/left margin]]
Everything very quiet now 7:30. Only occasionally burst "Laf" song.

[[left margin]] Laf [[/left margin]]
I have been observing along a ravine. Sort of a gorge. And the "Lafs" have been singing on slopes above edge of ravine. This is the reason I haven't been able to see them. 

[[left margin]] Cy Humer Laf [[/left margin]]
Presumed Cy (invisible) sings repeatedly 7:45. Long phrases introduced by "Tsit"s. Then a "Humer" starts to sing. Short phrases. Without R. Finally see the bird. Definitely a Humer (can't see shoulder patches, rather slatey underneath, but it can't be an Albi). Sometimes phrases "Cy" and Humer alternate. More often Humer starts phrase a few seconds after "Cy" and there is a large, or even complete, overlap (sometimes Humer phrases are so short that the Humer begins a phrase after "Cy" but still finishes before "Cy"). Once a Laf utters brief phrase overlapping both "Cy" and Humer!!

[[left margin]] Gen [[/left margin]]
The birds here are certainly comparatively careless about overlapping songs!

[[left margin]] Cy Laf Humer [[/left margin]]
The territories of the Cys, Humers, & Lafs here seem to overlap, but probably only partially. 

Humers may be careless about overlapping songs other species simply because they are so comparatively rare here that they have to "interrupt" in order to make themselves heard. 

[[left margin]] Cy Laf Humer [[/left margin]]
Humers definitely seem to be "crowded" between zone in which Cy is dominant and zone in which Laf is dominant.

[[left margin]] Laf [[/left margin]]
"Laf"s still singing occasionally 8:02. Other species silent.

[[left margin]] Cy [[/left margin]]
Then Cy starts again. Obviously same bird that sang with Humer earlier. At first singing in same place as before. Same type songs