turkey in build. Elsewhere, the lesser rhea has been cited with a lower average weight of 16 kg. In some areas, male greater rheas weights of up to 35 kg are not uncommon and even females of up to 30 kg have been weighed, both weights higher than the maximum known mass for the lesser rhea. Large males can weigh up to , stand nearly 1.83 m tall and measure over 150 cm long, although this is uncommon.

The head and bill are fairly small, the latter measuring 8 - 10.4 cm in length. The legs are long, with the