The largest sea bird is the ALBATROSS, which has a wingspan of up to 3.5 meters and can weigh up to 11 kilograms. It is a large seabird of the family Diomedeidae, which is found in the Southern Ocean and the North Pacific. Albatrosses are known for their long-distance flights and can travel thousands of kilometers in search of food. They are also known for their graceful gliding and soaring abilities.