Zeus turned Io into a heifer.
She was turned into a heifer to protect her from Hera.
Hera turned her husband's lover into a cow guarded by a 100- eyed monster
Io, one of the moons of Jupiter was transformed into a heifer by Zeus' wife Hera who was jealous of his interest in her.
Here are some of Hera's powers: 1. Hera turned Lamia into a monster. 2. Hera turned Gerana into a crane. 3. Hera turned Io into a beautiful white heifer. 4. Hera disguised herself as Semele's nurse. 5. Hera turned Callisto into a bear. 6. Hera cursed Echo to only repeat the words of others (hence our modern word "echo"). 7. Hera sent a gadfly to bite the cattle of Geryon. 8. Hera's powers are commanding the winds and watching over women and motherhood. 9. Godspeed.
In the Movie "The Clash of the Titans" Io says that she was "cursed with agelessness" because she resisted the advances of Poseidon. This is 100% incorrect. Io was the lover Of Zeus, and when Zeus's wife found about that he was having an affair she basically went banana's looking for Io. So Zeus turned Io into a heifer, which is a cow before it has calves, to try protect her. But, Then Zeus's wife, Hera, discovered this and demanded Zeus gave Hera the Heifer to Hera as a present. What could Zeus do but comply so not to arise suspicion.
The Greek goddess Hera could change her shape and height.
Zeus turned one of his lovers, Io, into a heifer (cow) in order to hide her from Hera (his wife). This didn't work because Hera then asked the the cow as a gift, which she gave to Argus (the 100-eyed monster) to guard.
Hera could travel in her chariot or go where she willed as a goddess.
Hera, Queen of Heaven and goddess of marriage and the starry sky, is wife of Zeus in Greek mythology. Io was the lover of Zeus whom Zeus - not Hera - turned into a white heifer when Hera came upon Zeus and discovered his affair. Hera was not fooled by Io's shape and asked to have her, Zeus could not disagree and gave Io to Hera, who put Io in the keeping of Argos Panoptês - Zeus later sent Hermes to save Io. Hermes killed Argos, and Hera put his hundred eyes on the peacock and sent a gadfly after Io, which kept her from rest with it's sting. Io eventually came to Egypt, where she was identified with Isis, and her son Epaphos with Apis.
Io
The moon of Jupiter called Io was named after Io, a priestess of Hera who became one of the lovers of Zeus. Wikipedia says: In Greek mythology, Io (pronounced /ˈaɪ.oʊ/ EYE-oh or /ˈiː.oʊ/, in Ancient Greek Ἰώ[iːɔ́ː]) was a priestess of Hera in Argos who was seduced by Zeus, who changed her into a heifer to escape detection. Her mistress, Hera, set ever-watchful Argus Panoptes to guard her, but Hermes was sent to distract the guardian and slay him. Heifer Io was loosed to roam the world, stung by a maddening gadfly sent by Hera, and wandered to Egypt.
Io was a mortal woman who was favored in the sight of Zeus. He then turned Io into a heifer, to hide her from his wife. However, Hera was no fool and had set spies upon Io. After Io's transformation, Hera afflicted her with a gadfly (irritating biting fly) to torment her, as punishment.