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[[circle]] 225 [[/circle]]

[[underline]] hirundinacea [[/underline]]

December 31, 1955,
Porvenir Bay.

There are quite a number of these birds here, and they are quite active, both in the air, and on the ground (and even on the water; but I haven't been able to pay much attention to them. They aren't around near the Dolphin Gulls.

As far as I can tell their calls, and they certainly have a great variety of them, sound just like the Common Tern.

All the birds appear to be incomplete nuptial plumage, except for one or two with a little white on the forehead. 

They definitely have a Stretch posture. Often used as greeting. Looks just like that of their relatives. Sometimes [[image-drawing of standing bird with head and neck pointing sharply upward]] apparently silent. Often with a call "Ka haa haa haa" I think. Then the bill is slightly open, mandibles opening and closing, I think, in rhythm with the notes. It is my impression that, during M.C.'s, the posture is first assumed with the call, and then, presumably as the intensity of something decreases, the call stops while the posture is still maintained. "Lower intensity" forms of the posture are characterized, by lower, more nearly horizontal, bill. A [[presumed?]] variant of the Stretch, possibly "lower intensity" or possibly due to different relative strengths of the hostile drives, is an Upright [[image-head of bird with beak horizontal]] This tends to follow the V during MC's. Both the St and V are often accompanied by Tilting during MC's. The less vertical forms of the St and the V may [[underline]] also be accompanied by HF. [[/underline]]

There is also a Scooping complex. Little bowing movements, very rapid, from St. The posture at the bottom of the bow is reminiscent of the "[[Beugestellung?]]"; but less extreme. [[image-drawing of bird's neck and head, pointed downward]] This Scooping is definitely accompanied by the "Kaa haa haa. . . " or "Ka ha ha ha. . . ." call. [[underline]] The whole performance, with its call and its down & up movements, is very reminiscent of the [[Glik?]] of Franklin's Gull [[/underline]], (and also the pattern I interpreted as [[Glik?]] in the Elegant Tern. The only Scooping I have seen was performed by  

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