Final answer:
In the myth of Leda and the Swan, the swan is Zeus in disguise, who seduced Leda and fathered Helen of Troy.
Step-by-step explanation:
In the myth of Leda and the Swan, the disguised swan is no ordinary bird, but rather a powerful god from Greek mythology. The swan is a transformation taken by Zeus, the king of the gods, who was known for his numerous liaisons and adventures with various characters, both divine and mortal. In the guise of a swan, Zeus approached Leda, and from their union, two sets of twins were born, one of which included Helen of Troy, whose abduction led to the Trojan War.