Corrine (also known as Mother) is one of the main antagonists of the episode "Freebird"
Biography[]
When Rapunzel and Cassandra travel deep into a neighboring forest on their journey and run into them, it show that they can turn into birds with magical tea brewed from a magical teapot and can release the transformation with the breaking of a special egg. It is unclear what the actual relationship is between Harold and Corrine, but they travel together searching for people that they can change into birds forever and they're most likely husband and wife.
Her avian form is an eagle which strikes fear into other birds.
Mother's bird form