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Tangara, Mar. 25, 1961, III

female" and "the male" from now on, without qualifications.) Twice the male brought n.m. when he accompanied the female. Each time he gave it to her and let her work it into the nest.

At least one of the A birds (and almost certainly both) showed a definite tendency to utter "Zreeeeeee" notes as the birds came into land in the small tree in which the branch was located. Also when hopping and flying about within the same small tree. Probably most of these "Zreee"s were uttered in flight; but I am almost certain that some of them were uttered by perched birds which did not fly immediately afterwards.

These "Zreee" notes were obviously the same as the ones I heard on Mar. 20, 1961, (see p.44). Have a definite but slight mmmmm undertone. They could be something like SN's with an added undertone; but I think that they are really muffled and probably somewhat accelerated "variants" of the CN Trll patterns.

Both the A birds tended to utter typical CN Trll's (or even unusually loud and hard CN Trll's - see below) as they flew away from the nesting tree, instead of uttering "Zree" notes. They also sometimes uttered typical CN Trll's as they came into land; but CN Trll's were much less common than "Zreee" notes in such circumstances.

Once one of the birds uttered "Zreee" notes while perched, and then continued (without interruption) with CN Trll's as it flew off.

Every once in a while one or both birds of the A pair would fly away from the nesting tree quite silently. They did this when they did not appear to be any more alarmed than usual, or not alarmed at all.

This behavior would seem to confirm the hypothesis that the CN Trll's of this species are at least partly hostile - not just purely

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