Answer:
What stays the same size no matter how much they weight?
A tiny bead, like fragile glass, strung along a cord of grass.
Weight in my belly, Trees on my back, I travel fast in my place, but feet is a feature I lack
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
What moves without seeing and cries without eyes?
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?