Histology of a stingray digestive tract includes, mouth, pharynx, esophagus, stomach, interior intestines, posterior intestines, ending in a cloaca.

​

​

Stingrays have developed an unusual structure in the intestinal tract called, the spiral valve. As food passes through the digestive tract, it passes through the spiral valve, and thus the waste has a ribbon-like twisted appearance. The liver of stingrays are quite large, and oily. 

​

​

Stingrays are bottom feeders. They do not have sharp teeth like sharks, so depending on what kind of specie they may either have, two hard plates or just sucking mouth parts.

​

They mainly eat mollusks and crustaceans, but because their eyes are right on the top of their head they can't see ther prey. So they use their sense of smell and they electric field sense.

​

Stingrays need big livers because it acts as buoyancy because they lack swim bladders.