Narwhal
NARWAL, or NAR- WHALE, a cetacean, called also the seaunicorn; the Monodon monoceros. The name sea-unicorn is given because the male has a horn 6, 7, or even 10 feet long, one of the teeth in the upper jaw extraordinarily prolonged. It is the left tusk which makes the horn, the right being rarely developed. The tusk is spirally furrowed, and is of ivory, like the tusk of an elephant. The length of the narwhal varies from 15 to 20 or 22 feet, the head being one-fourth of the whole, and the horn one-half.