Riddles - Solution

What goes up and down the stairs without moving? 

A rug.  

I'm the part of the bird that's not in the sky. I can swim in the ocean and yet remain dry. What am I?

A shadow.

I am mother and father, but never birth or nurse. I'm rarely still, but I never wander. What am I?

A tree. 

I went into the woods and got it. I sat down to seek it. I brought it home with me because I couldn't find it. What is it? 

A splinter. 

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I? 

 A hole. 

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