Answer:
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
What can be forever wound up but never annoyed?
A hill full, a hole full, yet you cannot catch a bowl full.
This is needed both for courage and hardcover books.
Iron on a mammal. Mammal on your feet.
I'm the source of all emotion but I'm caged in a white prison.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?