title: Evolutionary biology. Darwin's avian muses continue to evolve.
authors.forename: Carl
authors.initials: C
authors.lastname: Zimmer
mesh_terms: D000818:Animals; D001502:Beak / Q000033:anatomy & histology; D005075:Biological Evolution; D002980:Climate; D004484:Ecuador; D005260:Female; D005502:Food; D014644:Genetic Variation; D005828:Genetics, Population; D006824:Hybridization, Genetic; D008297:Male; D012639:Seeds; D012641:Selection, Genetic; D012726:Sexual Behavior, Animal; D020308:Songbirds / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology