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In page Claudius Aelianus:

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On the Nature of Animals (alternatively "On the Characteristics of Animals"; Ancient Greek: Περὶ ζῴων ἰδιότητος, Perì zṓōn idiótētos; usually cited by its Latin title De Natura Animalium) is a collection,[1] in seventeen books, of brief stories of natural history. Some are included for the moral lessons they convey; others because they are astonishing.[citation needed]