static void Main(string[] args)
{
Console.WriteLine("Simulating Mullard Duck... \r\n");
var mallard = new MullardDuck();
mallard.Quack();
mallard.Fly();
Console.WriteLine("\r\nSimulating Model Duck... \r\n");
var model = new ModelDuck();
model.Quack();
model.Fly();
Console.Read();
}