Hag

Rasmus directed me to this one. Take a gander at the hagfish. This primitive fish comes with some interesting factoids:

1) It has no fins, save for a rudimentary tail.
2) They excrete an obscene amount of slime when threatened.
3) They can tie themselves into literal knots.
4) Though they feed primarily on invertabrates, they have the pleasant habit of burrowing into dead animals and eating them from the inside out.

Now, isn't your life all the richer? You're welcome.

Photo courtesy: www.lemonodor.com