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mammals × 224zoology × 67
evolution × 51
species-identification × 19
ethology × 13
physiology × 12
marine-biology × 12
anatomy × 10
ecology × 9
reproduction × 9
behaviour × 9
human-biology × 7
milk × 7
ornithology × 6
rodents × 6
food × 5
taxonomy × 5
skin × 5
genetics × 4
biochemistry × 4
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development × 4
ichthyology × 4
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