The Japanese Eagle Ray is a type of ray seen only in Endless Ocean: Blue World.
"These rays have a characteristic almond shape and long tail. They swim using their large winglike fins as if flying and sometimes swim together in groups of about a dozen. They are often seen lying perfectly still on the seabed."
Both groups of Rays swim around slowly and seemingly aimlessly, only banded together loosely. This creature likes being stroked and being in pictures, and they do not respond very much to food, due to their constant movement and unwillingness to change their current course to go back and eat the food they are being offered.