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|Research Interest:||Little is known about Cerulean Warbler (CERW; Setophaga cerulea) habitat requirements and breeding behavior in western Maryland. Game theory predicts that territorial males are more aggressive in higher quality habitat. Presentation of a decoy CERW and playback of conspecific song will be conducted at the center of territories and aggression scores will be calculated from behavioral response of territorial males at three field sites in western Maryland. Vegetative surveys will also take place at the center of territories and compared to control plots for habitat use versus availability analysis. Morphology, territory quality, temporal differences through the breeding season, and proximity of neighboring CERW will be correlated to significant differences in aggression between individuals and sites. Correlates of habitat quality and aggression will elucidate the importance of conserving high quality habitat and understanding breeding behavior of an at-risk species like CERW, for which land managers seek data.|