1) Woman in Greek mythology 
Acanthis (not to be confused with Acanthus) may be: ...[mythology] Acanthis (Ἀκανθίς) or Acanthyllis (Ἀκανθυλλίς) was the daughter of Hippodamia and Autonous and sister to Anthus, Erodius, Schoenous and Acanthus. When their father`s horses attacked Anthus out of hunger and ate him, Zeus and Apollo, out of pity for the grieving family, transformed them into birds. Acanthis thu...