The Narwhal is a species of WHALE that is also known as the 'unicorn of the sea'. It is a medium-sized WHALE that can grow up to 5.5 meters in length and weigh up to 1, 600 kilograms. Its most distinctive feature is its long tusk, which can reach up to 3 meters in length. The Narwhal is found in the Arctic Ocean and is an important part of the marine ecosystem. It is a migratory species and its diet consists mainly of fish, squid, and shrimp.