Passage 8.12.3
τούτου τοῦ Ἀλκιμέδοντος θυγατρὶ συγγενέσθαι Φιαλοῖ ὡς Φιγαλεῖς λέγουσιν Ἡρακλέα· ὡς δὲ ᾔσθετο αὐτὴν ὁ Ἀλκιμέδων τεκοῦσαν, ἐκτίθησιν ἀπολουμένην ἐς τὸ ὄρος, σὺν δὲ αὐτῇ καὶ τὸν παῖδα ὃν ἔτεκε· καλοῦσι δὲ Αἰχμαγόραν αὐτὸν οἱ Ἀρκάδες. ἀνακλαίοντος δὲ ὡς ἐξέκειτο τοῦ παιδός, κίσσα ἡ ὄρνις ἐπήκουέ τε ὀδυρομένου καὶ ἀπεμιμεῖτο τὰ κλαύματα·
According to the Phigalians, Heracles had intercourse with Phialo, the daughter of this Alcimedon. When Alcimedon perceived that she had borne a child, he exposed her on the mountain to perish, along with the child she had borne; the Arcadians call this child Aechmagoras. As the child lay exposed and cried aloud, a bird, the jay, heard his weeping and began to imitate his cries.