Answer:
because of his cruelty in the nature
Calibos was spoiled by his mother, but he was handsome. Zeus gave him the wells of the moon in his care but Calibos instead hunted trapped and killed every living creature. Including Zeus' herd of sacred flying horses, all except the one remaining horse Pegasus. As punishment for his shameful mark of vile cruelty, Zeus transformed him into a being abhorrent to human sight, becoming a mortal mockery and thus being shunned and forced to live as an outcast in the swamps and marshes. He had horns, a devil tale, and the face of a demon. His mother, Thetis (Goddess of the sea), retaliated by punishing Andromeda and the city. She ordered Andromeda to be killed as a virgin, or the city would suffer and be destroyed by a sea monster- the kraken.