According to mythology, why was Callisto turned into a bear?

Her condition was eventually revealed during the bath and Artemis and in her fury the goddess transformed Kallisto into a bear. Hunters later caught and delivered her and ... l. c.) According to Hyginus, Artemis herself metamorphosed Callisto, as she discovered her pregnancy in the bath. read more

Some, too, have said that when Callisto was embraced by Jove [Zeus], Juno [Hera] in anger turned her into a bear; then, when she met Diana [Artemis] hunting, she was killed by her, and later, on being recognised, was placed among the stars. read more