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[[circled]] 27 [[/circled]] [[circled]] 65 [[/circled]]

[[margin in red]] Carbo [[/margin]]
gradation between typical R-Zaza's and rapid twitters. The Carbo(s) uttered almost every possible intermediate at one time or another.

October 18, 1963
La Paz

Worked in the same place this morning as yesterday morning and evening.

SEE TODAY'S NOTES ON MIXED DIGLOSSINI

Just before 9:00 am., I came across a group of 4 or 5 [[underlined]] Th. bonariensis [[/underlined]] In fruit trees (cherries?) in bloom, and in Eucalyptus I think that only one of the birds was an adult [[male symbol]] in bright plumage. All the birds were quite remarkably quiet, probably quite silent. Not associated with other species. Is this quietness and adaptation to keeping apart from other species? Otherwise the [[underlined]] bonariensis [[/underlined]], with the bright colors of the males and the dull colors of the females and young, and their gregarious habits, would inevitably tend to become the passive nuclei of mixed flocks.

I think that the only really organized mixed flocks that occur here are [[underlined]] Spinus [[/underlined]] flocks. There seem to be 2 species of [[underlined]] Spinus [[/underlined]] here. One looks like the Chiriquí species. The other is larger. The males of this latter are largely black, with yellow on the wing and the abdomen. I have seen individuals of these 2 species moving around together - but I don't know how frequently. Possibly the [[underlined]] Spinus [[/underlined]] flocks attract other small seed-eating finches (e.g. Catamenia) occasionally. They do not attract any bush-finches, tanagers, honey creepers,