Cormorants are large black water birds that belong to the Phalacrocoracidae family. They perch upright on rock cliffs and are often found drying their feathers with their wings stretched out. They have slender hooked bills, bluish-green eyes, long tails and webbed feet. Sexes are alike in appearance. Adults may have colorful face or throat pouches. Juveniles are brown. Cormorants swim low in the water with their bills slightly upturned. The head and neck are also upturned in flight. Flocks fly in a line or wedge formation. They dive for fish and crustaceans.