The term 'Bird with Calf Muscles' can be summarized as the EMU, a large, flightless bird native to Australia. The EMU is the second-largest living bird by height, after its ratite relative, the Ostrich. It has a long neck, a small head, and long, strong legs with calf muscles that allow it to run at speeds of up to 50 km/h. The EMU is an important cultural icon of Australia, appearing on the coat of arms and various coins.