"You are probably also confused (amused?) by the fact that your bow, for some reason, shoots Chickens."— Patch notes(src)
The special effect causes a chicken to occasionally spawn along with fired arrows and fly in tandem with them, dealing 500% damage as Physical to one target it hits, and confusing the victim for 2 seconds.
Stats (Level 50)Edit
This bow has been tainted by some strange magic indeed.