Your fingers give you a good reason to pluck things. You pluck flowers out of the ground. You pluck a cat out of a tree. Why? Because you have fingers! That's your reason.
Now that you have a reason to pluck things (you have fingers, after all) you decide you want to pluck all the fur off of Chewbacca (ちゅう). He is very furry, and you want to know what he looks like under there.