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Birds 35 Ornithology 21 ornithology 18 ornitologie 14 birds 12 fauna 10 ptáci 10 more ... Ornithologie 9 Vögel 9 Classification 5 Oiseaux 5 Zoology 5 Eulenvögel 4 Greifvögel 4 Wirbeltiere 4 Zoologie 4 Birds -- Pictorial works 3 Birds -- United States 3 Early works to 1800 3 Fugler 3 Natural history 3 Ornitologi 3 migrace živočichů 3 Agriculture 2 Animaux et plantes nuisibles 2 Bibliography 2 Birds -- Classification 2 Birds -- North America 2 Botanique 2 Falconiformes 2 less ...