What is it???

stacey4u2luv said:
another clue


Without the sun there can be none.

Hey, I already got it, but left the answer out of my response. It goes where the xxxx is in my previous post.

These are good riddles. A couple are from Tolkien's work (the fish and the egg ones).
 
I do it standing, Stacey does it sitting and a dog does it on three legs.
What is it?
 
Shake hands.

(and xxxx = shadow in the previous one.)