The Gemara in Chullin (137b) asks where several characters of the Megillah are found in the Torah: Esther (Devarim 31:18), Mordechai (Shemos 30:23), and Haman (Bereishis 3:11), as well as Moshe (Bereishis 6:3).
This passage appears in the middle of a discussion of the mitzvah of Shiluach HaKan. Why does it appear here?