Answer:
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
Light hides me and darkness kills me. What am I?
When I get closer my tail grows longer but when I go away my tail leads the way.
I will disappear every time you say my name.
I can only be played on a windy day
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?