Avian functional anatomic problems.
D000222:Adaptation, Physiological; D000818:Animals; D001158:Arteries / Q000033:anatomy & histology; D005075:Biological Evolution; D001717:Birds / Q000033:anatomy & histology / Q000502:physiology*; D005241:Feathers; D009130:Muscle, Smooth / Q000033:anatomy & histology; D012119:Respiration; D013045:Species Specificity