You can see me in the dark. Sometimes, you cannot see me because I'm too shy to look at you. But please don't judge me until you see my true and full self. What am I?

I’m tiny and fuzzy and spry, with a curious glint in my eye. I pounce and I play, Sleep most of the day, and chase things that flutter or fly.

I am known for flying, but I do not have wings. You might blow me.

No stem, no seed, no blooms to show. I paint the rocks where rivers flow. What am I?

When take it, it's black. When use it, it's red. When used, it's gray. What is it?