Answer:
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
I'm full of holes, yet I'm full of water.
My teeth are sharp, my back is straight, to cut things up it is my fate.
What goes in the water black and comes out red?
Who is that with a neck and no head, two arms and no hands? What is it?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?