My favorite breed that is an old breed ( but I dont believe is a rare breed) is the Dutch bantam. they come in a multitude of colors and have no standard counterpart. I love their personality and their tiny stature. I believe that they are the second smallest bantam ( first being the Serama). I love watching them run around during playtime. They originated in medieval Holland because with their small stature they produced a tiny egg that the lord of the manor could not tax, as well as then need very little feed and if free ranged almost none.