Elephants use their trunks as snorkels, to rip plants apart, give themselves dustbaths, pick things up, smell, breathe and and drink. Pretty multi-functional if you ask me. While I would consider an elephant's trunk an organ (olfactory), I would consider a kangaroo's tail more of an appendage.

According to a recent study (http://www.newscientist.com/article/dn25829-zoologger-meet-the-only-animal-with-five-legs.html#.U7eA81xqryc), kangaroos tails function as a fifth leg.

I am wondering what other animals, if any, have similar multi-functioning organs?