Answer:
What has to be broken before it can be used?
Walk on the living, they don’t even mumble, Walk on the dead, they mutter and grumble. What are they?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
Talks like this, a green wise man does. Guess my clue, you will.
I can only be played on a windy day
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?