title: The reproductive cycle in the male bullfrog, Rana catesbeiana in Missouri.
mesh_terms: D000818:Animals; D004432:Ear, Middle / Q000254:growth & development*; D005260:Female; D008297:Male; D009929:Organ Size; D011892:Rana catesbeiana / Q000502:physiology*; D012741:Sexual Maturation; D013091:Spermatogenesis; D013737:Testis / Q000033:anatomy & histology*; D013997:Time Factors