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[[red]] serranus. [[/red]] INDEX, 1955. [[circled]] 6[[/circled]] 193. F with tail above wings, tail spread, Dec. 15, 197 Sketches of F., Dec. 14, 193; XIX [[underline]] Choking. [[/underline]] Description of posture & notes; zoo bird; Nov. 20, 111; Nov. 23, 116; wild birds; Dec. 14, 194. Tail above wings, not spread, Dec. 14, 194. Circumstances in colony; Dec. 14, 194; Dec. 15, 196. As part of greeting, wild birds; Dec. 14, 194; Dec. 15, 196. Zoo bird, aggressive toward me, Nov. 20, 111. Has choking partly "taken the place" of the L.C. performance (?), Dec. 14, 195. [[underline]] PAG. [[/underline]] Zoo bird, in association with choking, Nov. 20, 111. [[underline]] Example of series of threat & appeasement display on ground, presumably exemplifying gradual decline of intensity. [[/underline]] Dec. 15, 196. [[underline]] FB note and HB. [[/underline]] Zoo bird, from V, Nov. 23, 116 [[underline]] ♀ FB from ♂. [[/underline]] Wild birds, Dec. 14, 194 [[underline]] ♂ Regurge [[/underline]] Wild birds, Dec. 14, 194 [[underline]] ♂ Regurge [[/underline]] Wild birds, Dec. 14, 194 [[underline]] Redirected ♂ hostility as reaction to ♀ FB. [[/underline]] Dec. 14, 194 [[underline]] ♂ HB before Copulation int. movs. [[/underline]] Dec. 14, 195. [[underline]] Cop. Call. [[/underline]] Dec. 14, 195. [[red]] Catharacta skua chilensis. [[/red]] INDEX, 1956 A few brief notes, Jan. 3, 228, 229. Including: [[underline]] Physical description of the birds. [[/underline]] Various forms of [[underline]] violent aerial hostility [[/underline]], probably unritualized [[underline]] Aerial L.C. [[/underline]] [[underline]] Aerial Al.C. [[/underline]], description, and a discussion of the phylogenetic implications thereof