Morphology and evolution.
D000715:Anatomy; D000717:Anatomy, Comparative; D000818:Animals; D005075:Biological Evolution; D002645:Chickens / Q000033:anatomy & histology; D004626:Embryology; D005121:Extremities / Q000254:growth & development; D005247:Feeding Behavior / Q000502:physiology; D005399:Fishes / Q000033:anatomy & histology; D005796:Genes; D051379:Mice / Q000033:anatomy & histology; D008961:Models, Structural; D009024:Morphogenesis; D009132:Muscles / Q000033:anatomy & histology / Q000502:physiology; D009154:Mutation