Viewing page 203 of 299

This transcription has been completed. Contact us with corrections.

[[circle]] 33 [[circle]]
Mixed Diglossini, Oct. 27, 1962, V.

[[left margin]] Laf Humer [[/left margin]]
break down when the birds sing (i.e. overlaps occur). The songs of the 2 species are so different that they must be easily recognizable by the birds themselves. (On the other hand, the songs of Humer are not more different from the songs of Laf than are those of Cy, Geor, Albi, or Ruf - none of which overlap with Laf songs.) Do Laf & Humer songs overlap only when the singing birds call see one another? Or have the birds learned that the songs of the other species are uttered by birds that look like themselves?

[[left margin]] Bari  8300 ft [[/left margin]] 
3:45 pm. Working this afternoon in gardens of University 8300 ft. See a pair of Baris feeding on orange tubular flowers. Silent. Also hear "Humer" song, without R component, in same area.

[[left margin]] Bari Bari [[/left margin]] 
4:00. See a single ♀ Bari feeding on some flowers another garden. 

[[left margin]] Bari [[/left margin]]
Oh! oh! oh! See a ♂ Bari singing in tree above this garden. About 30 ft. above ground. And its song is a Twitter! Quite like Humer songs without R component. So I had better discount all my earlier records of "Humer" song, unless they contained R and/or I saw the singing birds! 

[[left margin]] Bari [[/left margin]]
It is possible that all Humer songs here have R components. If so, presumably in order to keep separate from Baris. (In this connection, I might add than an appreciable number of the Humer songs heard this morning included 2 R components.

[[left margin]] Bari [[/left margin]]
There is no doubt but that Bari is a bird of much more open vegetation (probably usually low) than any of the other Diglossini with which I am familiar.

There are quite a lot of migrant A. American warblers around