Eagle rays (the Myliobatidae family of fish) are a family of mostly large rays living in the open ocean rather than at the bottom of the sea. Eagle rays feed on snails, mussels and crustaceans, crushing their shells with their extremely hard teeth. They are excellent swimmers and are able to jump several metres above the surface.
The taxonomy of this group is uncertain; it is placed either in the order Myliobatiformes or Rajiformes. There are eight genera belonging to the eagle rays: Myliobatis (common eagle rays), Rhinoptera (cownose rays), Pteromylaeus (bull rays), Aetobatus (bonnet rays), Aetomylaeus (smooth tail eagle rays), Californica (bat rays), Mobula (devil rays), and Manta (manta rays). (In some taxonomies the devil rays and manta rays are placed their own family, Mobulidae.) [text source:Wikipedia]