The current North American standard calls for a chicken that is rumpless (missing their last vertebrae and lacking a tail), possesses ear-tufts (feathers that grow out from near the birds' ears), and lays blue eggs.
On realizing that that these bantams live without tail feathers to escape foxes, Kent Poultry Club chairman Dudley Mallett gave the tiny chickens the name Rumpless Game Bantams.