Abstract
Under experimental conditions, the sight and sound of a conspecific is conducive to nest building in domesticated male grey zebra finches, but sounds from unseen nearby conspecifics seem to block this stimulating effect. The sight and sound of nearby conspecifics, in addition to a single female cagemate, suppressed the rate of nest building, lowered building efficiency, and sound from conspecifics increased general activity. It is suggested that the close proximity of conspecifics evokes a flocking tendency that interferes with nest building. If this inference is correct, one of the selective advantages in the spatial separation of flocking and nesting areas, and in the wide spacing of nests in the colony, is avoidance of social stimuli that interfere with nest building.
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