(1) We investigated the signaling function of blue plumage in male blue grosbeaks to determine if structurally based coloration may act as a reliable signal of quality to conspecifics.(2) Songbirds like warblers, orioles, tanagers, grosbeaks , and sparrows are far from the only birds that display dimorphism.(3) She's had the best luck attracting seed-feeding birds, such as finches, grosbeaks , jays and nuthatches, by using common black oil sunflower seeds.(4) Finches, grosbeaks , titmice, nuthatches, sparrows, and cardinals will beat a path to your door.(5) So far, tantalizing reports of red and white-winged crossbills and pine grosbeaks remain just that: tantalizing, meaning just out of reach.
