title: Observations on the establishment, growth, and development of Hymenolepis hopkinsi Schiller, 1951 (Cestoda) in the mallard.
mesh_terms: D000818:Animals; D001715:Bird Diseases / Q000469:parasitology*; D004372:Ducks; D006925:Hymenolepiasis / Q000469:parasitology / Q000662:veterinary*; D008297:Male