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Studies the development of sibling recognition among common tern, Sterna hirundo, chicks. Exhibition of significant preference for broodmates over familiar nonsiblings; Preferential approach to siblings in broods with low levels of intrabrood aggression; Linking of responsiveness to visual and auditory senses.

Studies a common tern, Sterna hirundo, colony during the summers of 1996 and 1997 to test for socially facilitated preening. Evidence of spatial and temporal synchrony of preening behavior; Occurrence of preening often than expected in groups of three or more neighbors; Increase in proportion of preeners with tern density.