natural history
US /ˌnætʃ.ər.əl ˈhɪs.tər.i/
UK /ˌnætʃ.ər.əl ˈhɪs.tər.i/
1.
the scientific study of animals or plants, especially as observed in their natural environment
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She has a keen interest in natural history and spends hours observing birds.
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The museum has an impressive collection of exhibits on natural history.