title: Functional anatomy of the olfactory system in 23 orders of birds.
mesh_terms: D000717:Anatomy, Comparative; D000818:Animals; D001502:Beak / Q000033:anatomy & histology; D001522:Behavior, Animal; D005075:Biological Evolution; D001717:Birds / Q000033:anatomy & histology*; D001921:Brain / Q000033:anatomy & histology; D008032:Limbic System / Q000033:anatomy & histology; D009666:Nose / Q000033:anatomy & histology* / Q000502:physiology; D009833:Olfactory Pathways / Q000033:anatomy & histology; D010675:Pheromones; D012119:Respiration; D012903:Smell
chemical_list: D010675:Pheromones