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Atlapetes, Apr. 13, 1961, IV.   46
 
as before.

Then one bird flew away, into a thicket across a ravine. Immediately afterwards, I heard a series of rather variable song phrases coming from the thicket. More or less comme ça: "Ta-zeeeeeeee ta-zeeeeeeeee zeeeeeeeee" or "Ta-zeeeeeeee ta-zeeeeeeeeeeee" or "Ta zeeeeeeee zeeeeeee." I am certain that these songs must have been uttered by the chestnut-capped.

A few minutes later the bird that flew away was back, approaching its mate by hopping through the thicket. No "greeting", except (possibly) a somewhat accelerated series of "Trit" notes.

Later in the morning, I heard some sounds coming from a thicket about 1/4 of a mile away (i.e. certainly not within the territory of the pair I had been watching earlier) which appeared to be another type of chestnut-capped song (although I never saw the birds). More or less comme ça: "Ta zeeeeee zeeeeeeeee zeeeeeeee". Also sometimes "Ta zeeeeeeee zeeeeeeee zeeeeeeeee [[image - jagged line]] zeeeeeee" (The "[[image - jagged line]]" stands for a rather formless twitter).

All the Chestnut-capped songs I heard this morning were thin, high, and "whispering." All quite faint, except the notes which were strongly [[image - zigzag symbol]] They sound as if they might be "supersonic."

The Chestnut-capped and Yellow-throated Atlapetes seem to be quite well segregated where their ranges overlap in many areas. The Yellow-throats seem to prefer thickets in fields which were cleared fairly recently (where the thickets are not over-shadowed by trees); while the Chestnut-cappeds seem to prefer thickets in forest and woods But still the 2 species come into contact with one another quite frequently

I imagine that Pezopetes is the strongest competitor of the chestnut-capped here.