public PluckedBird(BirdForSale birdForSale) : base(birdForSale) { }
protected BirdForSale(BirdForSale birdForSale) { _birdForSale = birdForSale; }
public StuffedBird(BirdForSale birdForSale) : base(birdForSale) { }
public FriedBird(BirdForSale birdForSale) : base(birdForSale) { }