The Greater Flamingo, phoenicopterus roseus, or ruber, filters food from the water. The bill is specially adapted to capture and filter a combination of protozoa, algae, as well as crustaceans, mollusks and insects that make up its diet. It wades through shallow water with the bill held upside down. Water is sucked in through the partly open bill, and then squeezed out by the tongue. The row of spines, or lamellae at the edge of the beak filter out the food particles. These lamellae can be clearly seen in this image, along with the structure of the strangely shaped bill.