narwhale

The walrus and the narwhale are the most obvious living species, but male dugongs and some beaked whales can also have large tusks.

BoarCroc James Gurney 2010

PS neither whalrus nor narwhale can dive very deep, so this is not a good choice for "creature of the deep"

Narwhalrus S.T. Lewis 2006

And the tusk on a narwhale is on the LEFT side of it's upper jaw.

Narwhalrus S.T. Lewis 2006

I do not wish to seem inelegant, but this unsightly whale looks much like an amputated sow; and, as for the narwhale, one glimpse at it is enough to amaze one, that in this nineteenth century such a hippogriff could be palmed for genuine upon any intelligent public of schoolboys.

Moby Dick; or the Whale 2002

In old Norse times, the thrones of the sea-loving Danish kings were fabricated, saith tradition, of the tusks of the narwhale.

Moby Dick; or the Whale 2002

While elephant's tusks provided ivory for the southern races, the more northern peoples used the walrus and narwhale tusks.

Arts and Crafts in the Middle Ages A Description of Mediaeval Workmanship in Several of the Departments of Applied Art, Together with Some Account of Special Artisans in the Early Renaissance Julia de Wolf Gibbs Addison

The fabulous unicorn's horn, which is so often alluded to in early literature, was undoubtedly from the narwhale, although its possessor always supposed that he had secured the more remarkable horn which was said to decorate the unicorn.

Arts and Crafts in the Middle Ages A Description of Mediaeval Workmanship in Several of the Departments of Applied Art, Together with Some Account of Special Artisans in the Early Renaissance Julia de Wolf Gibbs Addison

The WHALEBONE of the mediaeval writers, which is described as very white, is doubtless the ivory of the walrus or of the narwhale.

Earth as Modified by Human Action, The~ Chapter 02 (historical) 1874

In the abridged London edition of 1807, there are plates of an alleged "whale" and a "narwhale."

Moby Dick: or, the White Whale Herman Melville 1855

I do not wish to seem inelegant, but this unsightly whale looks much like an amputated sow; and, as for the narwhale, one glimpse at it is enough to amaze one, that in this nineteenth century such a hippogriff could be palmed for genuine upon any intelligent public of schoolboys.

Moby Dick: or, the White Whale Herman Melville 1855