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Describes songs of house finches that have colonized eastern Wisconsin and East Coast. Details on the different types of colonization events that house finches have undergone; Importance of examining behavioral factors in considering the extent of a species' plasticity in acquiring the organizing principle of song production; Comparison of the song bird dialects; Variation in song characteristics.

Describes vocalizations of Black-chinned Hummingbirds, Archilochus alexandri, recorded during agonistic encounters at feeders. Background on the study; Methods used; Agonistic encounters; Note-types; Calls; Note transitions.