Morphology of the lower respiratory structures of the White Pekin duck.
D000400:Air Sacs / Q000033:anatomy & histology; D000818:Animals; D003964:Diaphragm / Q000033:anatomy & histology; D004372:Ducks / Q000033:anatomy & histology*; D005260:Female; D008297:Male; D010994:Pleura / Q000033:anatomy & histology; D012137:Respiratory System / Q000033:anatomy & histology*