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Habitat use by Song (Melospiza melodia) and Swamp (M georgiana) sparrows was studied along 1.2 km of contact between the species in northwestern Pennsylvania. The two species had only narrowly overlapping territories (4 to 5%). Several lines of evidence suggest that the opposite response of territorial sparrows to the presence of surface water accounts for this spatial segregation. The presence or absence of water was a nearly perfect predictor of which species was defending a particular areadoi:10.2307/1368570 fatcat:oh6ch3fw6venronczpxctrsreu