Answer:
Up on high I wave away but not a word can I say.
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
What covers its face with its hands, speaks no language, yet most known what it's saying?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?