"Vögel." . . "Fugle" . . "fugle" . "Diereneco- en -ethologie. Sociobiologie." . . "Vögel Gesang und Stimme." . . "Philosophy" . . "NATURE / Birdwatching Guides" . . "Birdsongs." . . "Musik" . . "chant d'oiseau." . . "Birds" . . "Birds." . . . . "Why birds sing" . . "Music" . "Music"@en . "Why birds sing : one man's request to solve an everyday mystery"@en . "Why birds sing : one man's request to solve an everyday mystery" . . . . . . "Electronic books"@en . "Niao wei shen me ming chang = Why birds sing" . . . . . . . "A musician and philosopher explores the science and art of bird song in a quest to determine if birds sing for other than sexual or territorial purposes." . "A musician and philosopher explores the science and art of bird song in a quest to determine if birds sing for other than sexual or territorial purposes."@en . "Why birds sing a journey through the mystery of bird song" . "Why birds sing : a journey through the mystery of bird song" . "鳥為什麼鳴唱 = Why birds sing" . "Why birds sing : a journey into the mystery of bird song" . . "Why birds sing : a journey into the mystery of bird song"@en . . "Why birds sing : a journey through the mystery of bird song"@en . . . "Niao wei shen me ming chang" . . . . "A beautiful and surprising exploration of a phenomenon that's at once familiar and baffling: the mystery of why birds sing."@en . . "A beautiful and surprising exploration of a phenomenon that's at once familiar and baffling: the mystery of why birds sing." . . "Why birds sing" . . . . "Warum Vogel Singen Eine Musikalische Spurensuche" . . "Why birds sing : a"@it . . "Perché gli uccelli cantano" . "Perché gli uccelli cantano"@it . . . "Why birds sing : one man's quest to solve an everyday mystery" . . . . . . . . . . . . . . . "鳥為什么鳴唱 = Why birds sing" . . "Warum Vögel singen : eine musikalische Spurensuche" . . . . . . . . . . . . . "鳥為什麼鳴唱" . . . "鸟儿为什么歌唱" . . . . . . . . . "Niao wei shen me ge chang" . . . . . "Einführung" . . . . "Adfærd" . . "Oiseaux Chant." . . "Uccelli - Comportamento." . . "Vogels." . . "NATURE / Animals / Birds" . . "Chant des oiseaux." . . "Canto degli uccelli." . . "SCIENCE / Life Sciences / Zoology / Ornithology" . . "Vogelgesang." . . "Music" . . "fuglestemmer" . . "Songs" . . "Rothenberg, David." . . "Sange" . . "Filosofi" . . "Birds Songs and music." . . "Gesang <Zoologie>" . . "Gesang." . . "Behaviour" . . . . "Uccelli canti e richiami." . . "Dong wu xing wei." . . "動物行為" . "Vogelgeluiden." . .