Passage 9.21.6
οὐ γὰρ δὴ ἄνθρωπος μόνον ὁμοῦ τῷ ἀέρι καὶ τῇ γῇ διαφόροις οὖσι διάφορον κτᾶται καὶ τὸ εἶδος, ἀλλὰ καὶ τὰ λοιπὰ τὸ αὐτὸ ἂν πάσχοι τοῦτο, ἐπεὶ καὶ τὰ θηρία αἱ ἀσπίδες τοῦτο μὲν ἔχουσιν αἱ Λίβυσσαι παρὰ τὰς Αἰγυπτίας τὴν χρόαν, τοῦτο δὲ ἐν Αἰθιοπίᾳ μελαίνας τὰς ἀσπίδας οὐ μεῖον ἢ καὶ τοὺς ἀνθρώπους ἡ γῆ τρέφει. οὕτω χρὴ πάντα τινὰ μήτε ἐπίδρομον τὴν γνώμην μήτε ἀπίστως ἔχειν ἐς τὰ σπανιώτερα, ἐπεί τοι καὶ ἐγὼ πτερωτοὺς ὄφεις οὐ θεασάμενος πείθομαι· πείθομαι δὲ ὅτι ἀνὴρ Φρὺξ ἤγαγεν ἐς Ἰωνίαν σκορπίον ταῖς ἀκρίσιν ὁμοιότατα πτερὰ ἔχοντα.
Indeed, it is not only mankind that acquires a variety of forms according to the differing qualities of air and earth, but other creatures would experience the same effect as well. For even among wild beasts, the snakes in Libya differ from those in Egypt in respect to their coloring; and in Ethiopia the land nurtures snakes that are black, no less than it does humans. Therefore, one should neither adopt a hasty judgment nor display skepticism toward rarer phenomena. Indeed, although I myself have not seen winged serpents, I find it credible that they exist; for I do trust that a Phrygian man brought into Ionia a scorpion having wings closely resembling those of a locust.