Clams that move do so by projecting a “foot,” which is a muscular, fleshy organ that can easily be projected from between the clams' two shells. Physically speaking, however, clams have no legs, arms, mouths or heads.
The shells of clams are opened via two strong muscles and are needed because clams themselves have soft bodies. Despite not having legs or arms, clams still have hearts and blood vessels. Clams also have gills, which are used for removing not only oxygen but also food particles from water. This is why clams don't require mouths to eat.
The foot is not the only thing that clams extend out past their shells. To both breathe and feed, clams have to stick the ends of their siphons outside of their shells. Food is drawn into the clams' bodies by using cilia, which stir up water and make small currents. At this point, the food is passed throughout the clams' digestive systems, and the excess water is forced back out through the siphons.
Both little-neck and hard-shell clams are often referred to as quahogs. This was a name given to them by the Narraganset Indians. They are traditionally found along the Gulf of Mexico and on the Atlantic coast.Learn More
Brine shrimp eat green algae by filtering water through their legs. Members of the order Anostraca, brine shrimp are small crustaceans that live in brine pools and other inland waters featuring high salinity.Full Answer >
A starfish eats by wrapping its arms around a bivalve's shell, prying it open, injecting its stomach into the shell and then digesting the prey. After digesting, it slides the stomach back into its body. This allows the starfish to eat food that cannot fit through its tiny mouth.Full Answer >
The pen of the squid stabilizes the mollusk while it is swimming. The pen is a stiff structure running the length of the animal's body.Full Answer >
Hammerhead sharks, large groupers, herons and humans eat stingrays. Hammerhead sharks, their biggest predator, have developed special sensors on their heads that allow them to find stingrays hiding under the sand.Full Answer >