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Birds Vögel 24 Anatomy 22 Migration 16 Oiseaux 15 Pictorial works 12 Classification 11 more ... Mammals 10 Embryology 8 Eggs 7 Flight 6 Geographical distribution 6 Ornithologie 6 Ornithology 6 Deutschland 5 Eggs and nests 5 Fishes 5 Catalogs and collections 4 Conservation 4 Evolution 4 Nests 4 Zoology 4 Animal behavior 3 Behavior 3 Birds of prey 3 Collection and preservation 3 Color 3 Embryologie 3 Natural history 3 Physiology 3 less ...