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145 Ramphocelus, April 29,1962, IV uttering TssN's. Male utters a few Φs without ΦR, more or less "Tseet-tseeyoo," during transition period. 6:48 Another visit by same visitor provokes similar behavior by captive birds. This time the male tends to fall silent during some of is pecking bouts with visitor. No tract of HAC or GHAC type notes at any time. No Back R by male when he is reacting to the visitor alone. But once he gets involved in a brief dispute with the captive female (his "own" mate), and the he does assume a Back R very briefly. Accompanied by Φ and/or ΦR. Some of the Φ and ΦR's during the dispute with the visitor are uttered so rapidly one right after the other as to be wavering or fluctuating in effect. Captive birds resume flying about with TssN's when visitor leaves. Leaving myself 7:05 a.m. Ramphocelus May 4, 1962 Barro Colorado Putting new male (banded lavender) in with old pair (male banded blue) 5:50 a.m. Still quite dark. A brief burst of NN's when new male first introduced. Then all birds freeze. Quite silent. Still silent 5:55. Then birds start to move around a little. 6:00 a.m. The Old male suddenly lands near the New male. The Old male utters R after R. Each R usually ending in an "Eeyoo" or "Eeyuh." While uttering their sounds, the Old male stands in a pre-flight semi-crouch posture, with a trace of Lt