Aquarium Field Trip

This is a picture taken by me of a stingray I saw at the aquarium. The ray interested me because it is different from most fish because it moves by flapping its "wings" and stingray bellies can also have interesting designs (sometimes looking like a face). The ray is from the phylum Chordata, class Chondrichthyes and a distinguishing characteristic that puts the ray into that class is it's endoskeleton which is entirely made up of cartilage.