Answer:
I look at you, you look at me, I raise my right, you raise your left.
What has 13 hearts but none beat?
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
I am always hungry, I must always be fed. The finger I lick will soon turn red.
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
You use it between your head and your toes, the more it works the thinner it grows.