The Tyrant Leech King!

By PLoS ONE

Leeches are gross.

And so are mucus membranes. (After all, they make mucus!)

And this year, scientists discovered a leech that feeds on mucus membranes. Blech! What do you call a creature this horrible? Try the Tyrannobdella rex: “tyrant leech king”!

Full story here...but look out! This story has a picture of the leech sucking on a human eyeball. Yeah.
BONUS: See the National Geographic list of 2010's weirdest new animals here!