Ant Eaters

The animal I selected was an ant eater. I wonder why the ant eater is the only animal that has a nose like that, used for one certain thing; in this case ants. Elephants have similar noses but are not quit the same. I wonder if any other animals have been passed this trait. Also, what other Genus created a nose such like that, that was passed to the ant eater. I'm also curious too

 why the nose is only used for ants?