Contents. 1  Inflammatory joint effusion AND Stiff hip: Causes of All Symptoms. 2  Inflammatory joint effusion OR Stiff hip: Causes of Any Symptom. 3  Inflammatory joint effusion: Causes. 4  Inflammatory joint effusion: Introduction. 5  Stiff hip: Causes. 6  Stiff hip: Introduction.
Sardines are an important part of the food chain. Jupiterimages/Photos.com/Getty Images. Sardines live in large schools that may contain thousands of fish. They typically feed on plankton and are close to the bottom of the food chain; many different kinds of predators eat sardines, including humans.
Stingrays eat a variety of foods. They can eat bundles of sea worms, shrimp, and clams. They may also eat soft shelled animals too. They like to take mollusks and small fish. When they hunt fish, they hunt in the upper water column. That means that they eat in the areas above the sea floor, about 10 meters up. Their fins are used for removing the top layer of sand off the sea floor while searching for buried food. They also can be used for swimming, but they are just a little useless.