I love the Wolverine. He's one of my favorites. One of the things I was surprised to find out was how he almost created as a badger rather than wolverine mutant. And, his famous claws were part of a glove originally, not an internal mechanism. Some other fun facts about Wolverine and the movies here.
http://screencrush.com/wolverine-facts/
http://screencrush.com/wolverine-facts/