title: Brief observations on the semen and spermatozoa of certain passerine and non-passerine birds.
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002171:Canaries; D004372:Ducks; D004822:Epididymis; D005777:Geese; D006863:Hydrogen-Ion Concentration; D008297:Male; D008854:Microscopy, Electron; D012661:Semen / Q000166:cytology*; D013094:Spermatozoa / Q000166:cytology*; D013194:Staining and Labeling; D014649:Vas Deferens