Answer:
I fly through the air on small feathered wings, seeking out life and destroying all things.
What can be seen but never found that only hides in the unwound?
What is the freedom of birds and the pen of old men?
Take one out and scratch my head, I am now black but once was red.
The one who makes it, sells it. The one who buys it, never uses it. The one that uses it never knows that he’s using 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?