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[[underline]] maculipennis [[/underline]], Dec. 30, 1955, II.

ied by wing-beats of slightly greater amplitude than usual.

Some birds circling around me have also performed short, shallow, flying Swoops and flying or gliding Soars. Some of these are redirected in vamo. Then the Swoop is accompanied by PCC notes, and the soar is accompanied by weaker PCC or LCN notes. Sometimes, however, these Swoops and Soars were directly orientated. [[underline]] Then the Swoops were accompanied by a most peculiar series of notes. [[/underline]]. Several times, at least, different birds did [[underline]] AlC note -> AlC notes -> Attack Call during Swoop. [[/underline]].

This sequence of calls suggests that the AlC notes of this species, like those of the Dolphin Gull (!), may contain a relatively stronger attack element than the AlC notes of most species of gulls. It also, in all probability, supports the suggestion that the "attack call" of the [[underline]] ridibundus [[/underline]] gulls is really a "combination" of AlC & LCN; or, rather, that the attack call is a less fragmented version of the LCN than is the AlC. (I must admit that I have great trouble in distinguishing the attack call of this species from a very rapid series of AlC notes). The Soars following these Swoops were accompanied by PCC or LCN notes. The whole Swoop-Soar performance in these circumstances can be diagrammed as follows:

[[image - diagram of swoops]]

I am fairly certain that the buzziest or "twangiest" aerial LCN's, those that are most like the LCN's of Bonaparte's Gull, are uttered by adult birds in non-nuptial plumage and/or immatures.

I still haven't heard any trace of a complete aerial L.C., although I have heard several birds utter long series of LCN's in very rapid succession. All the notes were more or less uniform in pitch: _ _ _ _ _ _