It is an adaptation.
That would be it's tusk.
It is called a tusk.
The Narwhal has a long ivory tusk.
The narwhal is called the "unicorn of the sea" because of its long, straight tusk that resembles a unicorn horn. This tusk is actually a protruding tooth and can grow up to 10 feet long in males. The unique appearance of the narwhal has led to this nickname.
a bulls (males) tusk is four feet long and a cows (females) tusk s two feet long
The whale that has a distinctive tusk is a narwhal it is native to the arctic ocean
For fashion
20 feet long.
to protect themselves
the mammoth or elephant
There teeth are 3 feet in height
It is a tusk.