A swan.

No. Helen was the daughter of Zeus and Leda (Leda, mortal woman married to King of Sparta). Aphrodite is one of the 12 Olympians (highest Gods/Goddesses in Greek mythology) - she was Goddess of Love, Desire & Beauty.

Thestius was the father of Iphicles, Althaea, Eurypylus, Evippus, Hypermnestra, Leda and Plexippus.

Leda was the mother of Helen in greek mythology. Zeus took her in the form of a swan, and she gave birth to her children like a swan would- with eggs.

Leda was the Aetolian princess, daughter of King Thestius, and the wife of the Spartan king, Tyndareus. Zeus was smitten by her and had children with her. Among them were Helen of Troy and Castor and Pollux. Though, there is another version that says Helen was the daughter of Nemesis and was adopted by Leda.