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Behavior of Northern Cardinals in rural and urban habitats (Photo by Andy Saunders).

Itinerant breeding in the Phainopepla (Photo by Don Schroeder).

Experimental tests of how aggression and duetting behavior are related to male paternity in a promiscuous species (Photo by Joe Welklin).

Testing the effects of divergent song and plumage color on subspecies interactions using mount presentations and song playback.

Experimental test of sexual selection on plumage color by manipulating the plumage of wild birds.

Genomic and morphological analysis of the Red-backed Fairy-wren hybrid zone.

Spatial modeling of geographic variation in sexual signals and morphometric traits.