# De animalium incessu 18

Aristotle, De animalium incessu, Chapter 18. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/aristotle/de-animalium-incessu/18

18 Εὐλόγως δὲ καὶ τὰ μὲν πτηνὰ πόδας ἔχει, οἱ δʼ ἰχθύες ἄποδες· τοῖς μὲν γὰρ ὁ βίος ἐν τῷ ξηρῷ, μετέωρον δʼ ἀεὶ μένειν ἀδύνατον, ὥστʼ ἀνάγκη πόδας ἔχειν· τοῖς δʼ ἰχθύσιν ἐν τῷ ὑγρῷ ὁ βίος, καὶ τὸ ὕδωρ δέχονται, οὐ τὸν ἀέρα. τὰ μὲν οὖν πτερύγια χρήσιμα πρὸς τὸ νεῖν, οἱ δὲ πόδες ἄχρηστοι. εἰ δʼ ἄμφω εἶχον, ἄναιμοι ἂν ἦσαν. ὁμοίως δʼ ἔχουσιν οἱ ὄρνιθες τρόπον τινὰ τοῖς ἰχθύσι. τοῖς μὲν γὰρ ὄρνισιν ἄνω αἱ πτέρυγές εἰσι, τοῖς δὲ πτερύγια δύο ἐν τῷ πρανεῖ· καὶ τσῖς μὲν ἐν τοῖς ὑπτίοις οἱ πόδες, τοῖς δὲ ἔν τε τοῖς ὑπτίοις καὶ ἐγγὺς τῶν πρανῶν πτερύγια τοῖς πλείστοις· καὶ οἱ μὲν ὀρροπύγιον ἔχουσιν, οἱ δʼ οὐραῖον.

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Aristotle, De animalium incessu, ed. Werner Jaeger. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg0086.tlg015.local001/.