casuariiformes vertebrate greater_rhea emu bird 척추 동물 새 grassland flightless_bird beak 부리 terrestrial_animal ratite

Emus

Like kangaroos, emus are from Australia. They are flightless birds similar in looks and characteristics to ostriches, though they average about 10 inches shorter in height. Unlike ostriches, emus can not walk backwards; however, it's not known why. Emus are known for their fast sprinting and long distance running. They're the only bird species that has calf muscles.