This is a preview. Log in through your library . Abstract Bobolinks (Dolichonyx oryzivorus) have a two song repertoire consisting of an alpha song and a beta song. The alpha song consists of distinct ...

Chestnut-sided Warblers (Dendroica pensylvanica) and Blue-winged Warblers (Vermivora pinus) sing different song types in different contexts. Local dialects exist in the "Unaccented Ending" songs ...