(Info from Wikipedia [link]
The eagle rays are a group of cartilaginous fishes in the family Myliobatidae, consisting mostly of large species living in the open ocean rather than on the sea bottom.
Eagle rays feed on mollusks and crustaceans, crushing their shells with their flattened teeth, while devil and manta rays filter plankton from the water. They are excellent swimmers and are able to breach the water up to several meters above the surface. Compared with other rays, they have long tails, and well-defined rhomboidal bodies. They are oviparous, giving birth to up to six young at a time. They range from 48 centimeters (19 in) to 9.1 meters (30 ft) in length