What am I?

Found at the back of a book or in an abdomen. What am I?

related riddles

I can be red, blue, purple, and green. No one can reach me, not even the queen. What am I?

I hide all my feet, Inside of my mouth. My nose you must push, to keep my tongue out. What am I?

A flash of light on a grey day. If you're made of metal, you best stay away. What am I?