He found his vocation in ornithology.他發(fā)現(xiàn)自己適于專攻鳥類學(xué).Botany, Entomology Herpetology, mammalogy, and ornithology.收藏植物學(xué) 、 蟲學(xué)、蟲學(xué) 、 乳動(dòng)物學(xué)和鳥類學(xué).Birds communicate by songs, and avian vocalization is a main aspect of ornithology.鳥類鳴...