The Great Cormorant (Phalacrocorax carbo) is a seabird in the family Phalacrocoracidae. Its feathers are mostly black, its body is large, from 2.53 ft (77 cm) to 3.08 ft (94 cm) long, with a wingspan from 3.97 ft (121 cm) to 4.89 ft (149 cm). Like the other cormorants, its feathers are not fully waterproofed, which makes it heavier in the water and allows it to dive quicker and deeper: the great cormorant can stay under water for 20 to 30 seconds without any problem and it can dive to 32.80 ft (10 m) and more to find its food. It is also one of the few birds to be able to move its eyes.
In China, a traditional fishing technique involves sending cormorants out to fish with a ring fitted tight enough around their neck, so they can’t swallow their prey. When the bird comes back to the boat, the fisherman only has to make it open its mouth to retrieve the fish.