Answer:
A box without hinges, lock or key, yet golden treasure lies within.
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
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.
The warmer I am the fresher I am.
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?