ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
φαιότης: -ητος, ἡ, οὐσιαστ. ἀφῃρημένον τοῦ φαιός, Ἀριστ. περὶ Φυτ. 2. 9, 5.