蛤蜊 (gé lí), commonly known as clams, are bivalve mollusks found in both freshwater and saltwater environments. They have two hinged shells that protect their soft bodies. Clams are often harvested for food and are popular in various cuisines around the world, including Italian and Asian dishes. Clams play an important role in their ecosystems by filtering water and providing habitat for other marine life. They can be found buried in sand or mud, and some species are known for their ability to dig quickly. Clams are also a source of nutrients for many predators, including birds and fish.