Clowns to the left of me, Jokers to the right of me, stuck in the riddle with you

 

From my home deep in the wood.

With teeth that don’t devour food,

Around me metal steadily spins.

I wait alone; trapped within,

When an arrow points up to the sky

All night and day those times I fly.

Alone I’m trapped up on the wall.

Tail swings beneath; I wait to call.

I then pounce out to scream and yell

And swiftly dive back in my shell.

 

As always post your answer in the comment section below, when the correct answer is give I will confirm!