The cormorant is a large fish-eating waterfowl, which is good at diving and can catch fish in water using its long and hooky mouth. It often flies low, skimming over water. While flying, their neck and feet often stretch out. In summer, they nest on rocky cliffs or tall trees near the water, or on low trees in marshes and lowlands. They don’t fear people. They often stay in the seaside, lakeside or fresh water. When perched, it can stand on a stone or stump for long. It has outstanding flying ability and generally stays in water, except for the migration period. It mainly feeds on fish and crustaceans. When hunting, it buries its head into water in search for prey. Its wings had evolved and acquired the ability to paddle. In waters that are covered by seaweeds, the cormorant mainly swims with its flippers. While in clear waters or waters with a sandy bottom, it uses both flippers and wings. In waters with low visibility, the cormorant often sneaks up on the prey, suddenly cranes its neck and wages a fatal attack. In this way, however flexible the prey is, it can never escape. Under the dim water, a cormorant is usually unable to see its prey very clearly. Thus, in order to attack with unfailing accuracy, it must rely on its keen hearing, and after catching the prey, emerge from water and swallow it.