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Birds Vögel 38 Anatomy 33 Oiseaux 21 Migration 16 Mammals 15 Classification 13 more ... Pictorial works 13 Deutschland 12 Embryology 9 Flight 8 Fåglar 8 Ornithology 8 Zoology 8 Eggs 7 Eggs and nests 7 Nests 7 Catalogs and collections 6 Early works to 1800 6 Geographical distribution 6 Mythology 6 Conservation 5 Digestive organs 5 Evolution 5 Insects 5 Natural history 5 Ornithologie 5 Vogels 5 Animal behavior 4 Birds of prey 4 less ...