What Am I? (Achievement #17 = 5 points)

Oh! Can you guess?

The game is on!

I'll give you clues

and hints to win.

Back and forth,

Forth and back.

I have feathers

but no wings

yet I fly fastest.

So take a swing.

Back and forth,

Forth and back.

I'm a cock

tho I can't crow,

don't let me fall

to ground below!

Back and forth,

Forth and back.

Make your guess

I've served my turn,

if you are right

one point you'll earn.

Back and forth,

Forth and back.