Old MacDonald's ducks are the most troublesome animals on the farm -- if they are not squawking and squabbling, you can be sure that they are up to some kind of mischief . . . Suitable for ages 4 - 7.Old MacDonald's ducks are the most troublesome animals on the farm -- if they are not squawking and squabbling, you can be sure that they are up to some kind of mischief . . . Suitable for ages 4 - 7.