Directional water-shedding properties of feathers.
D000818:Animals; D001696:Biomechanical Phenomena; D001717:Birds / Q000033:anatomy & histology*; D004372:Ducks / Q000033:anatomy & histology*; D005241:Feathers / Q000033:anatomy & histology*; D006112:Gravitation; D009949:Orientation; D014867:Water
D014867:Water