STINGRAY: Myliobatoidei The Southern stingray is the most common stingray in the waters of the Caribbean. Stingrays vary in form from an almost diamond shape to a disk shape and are often seen lying motion-less on the ocean floor. They are strong swimmers propelled by the graceful undulations of their wing-like pectoral fins which can span up to five feet. Their mouths and gills are on the underside of their bodies, yet their eyes are on the upper side. As a result, rays cannot see the food they eat, and must use special sonar to sense the location of their meals. They have many small, blunt teeth in their mouth which they use to crush the shells of mollusks and crustaceans on which they feed. A pair of large openings behind their eyes enables most stingrays to draw water for breathing without having to open their mouths.