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4

Rhamphocelus, Jan. 30, 1958, II              

Fnn is only produced when the escape drive is relatively strong.
  
One or both birds also uttered a call which is obviously related to the ordinary CN, but probably distinct. Sounded almost exactly like a definitely well organized series of CN's. Each series always appearing to be a distinct unit by itself. Most frequently, perhaps only containing 3 notes — but sometimes containing at least 6 or 8. The actual notes themselves were perhaps just a little softer, a little more "muffled," than ordinary CN's — and these series were always, apparently, given with the bill completely or nearly completely closed. I shall call each series of these notes a MCN. It was impossible to determine the motivation or function(s) of the MCN's; but almost all of them occurred during the general period when the "excitement" (the flying about and the fighting - see below) was at its height. This would certainly suggest that the MCN's are relatively high intensity patterns. They were not accompanied by particular ritualized postures or movements, except for the flicking, or course, and occasionally (in the case of those MCN's which occurred in the intervals between fights) a trace of Gfluff.
  
There was a good deal of overt unmistakable hostility during this visit. The visitor would fly down to hang on the side of the aviary, while the resident captive[[male symbol]] would fly to meet him and the 2 would hang there for a minute or so, literally face to face. One or both of them would then try to peck the other through the netting. I think the resident captive [[male symbol]] was more apt to be aggressive than the visitor; but I couldn't actually swear to this. The resident [[male symbol]] assumed what was definitely a Gfluff pattern during the periods he was hanging face to face with the visitor. This was probably some