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[[underline]] scoresbii [[/underline]]   [[circle]] 222 [[/circle]]

December 31, 1955, Porvenir Bay.

a.m. Same birds, same place.

Another L.C. performance.  This time by immature, (still with brown on upper wing- coverts, of HD-O-T with T note - T with T note. Exactly the same as that of adults, in posture and [[underline]] voice [[/underline]].

The LCN is [[underline]] remarkably [[/underline]] rare in this species.  There are hours, during which hundreds of T's occur, during which there aren't more than one or two LCN's, at most, in the group of birds feeding on ground.

The V, and the HF, are also extremely rare, (and the HF is rarer than the V) There may be 20 or more of these, all very low-intensity, for every one LCN in the group of birds feeding on the ground.
 
The only time at all where the LCN occurs with any appreciable frequency is just as the birds fly up.  Then it is almost invariable.  Probably also more common among birds flying along than in birds on ground. 

I might add, just to make things clear, that the voice of this species now sounds as if it came from a much larger bird.  Rather similar, in fact, to that of the Kelp Gull, (it's the "hoarse" quality of which is particularly reminiscent of the latter).

Another L.C. performance, by adult in almost complete nuptial plumage.  Simple O, "low-intensity O posture," diagonal Bill open, notes not muffled.  

Juv. does Juv.LCN -> T with T note after attack.

Have seen several cases of T after escape by adults in nuptial plumage

Thus the T's in immediate association with either attack or escape can largely be divided into the following categories:  a great many after attack, a few before attack, a few after escape.  This would suggest that the T pattern is low intensity; with [[underline]] the attack & escape drives about evenly balanced [[/underline]], or, [[underline]] just possibly, escape very slightly stronger than attack [[/underline]].  There is certainly no indication that escape is very much stronger than attack.  Thus, this T appears too be roughly comparable to the T of captive Laughing Gulls (and the T of the Ring-bill??); and, to some extent perhaps, the HF of many species

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