Scholion to Lycophron, Alexandra 85:
“Seals are rather eager in their erotic desire to set upon the beds of men. A seal is a sea animal most similar to (among land animals) a cow or a bear; but it enjoys the company of men. Seals are also quite useful for magic.”
αἱ φῶκαί τε αἱ θουρῶσαι καὶ ἐρωτικῶς ὁρμῶσαι ἐπὶ τὰ λέκτρα τῶν ἀρρένων βροτῶν. ἡ φώκη θαλάσσιον κῆτός ἐστι χερσαίῳ βοὶ ἢ μᾶλλον ἄρκτῳ παρόμοιον ἐρᾷ δὲ συνουσίας ἀνδρῶν. ἔστι δὲ καὶ πρὸς μαγείαν ἐπιτήδειον.
How did they know about this? Are there a lot of seals in Greece?