A new whatzit

Here's your newest what-is-it. A few of you might just know this, maybe not. The first person to correctly identify this animal will get a free smart-alec comment on your blog from me, and a possible credit in my next post.
My wife is not eligible for this, nor will she be helping anyone.
I will give you two clues.
1) I have seen them.
2) They are vicious.
Dani has correctly identified this critter. Yay Dani. Way to Go Dani. You rock Dani. Anyway, here's what Wikipedia has to say: http://en.wikipedia.org/wiki/Fisher_(animal)