An Emu is a large brown bird that lives in the Australian savannahs. Emus can be ridden as well. Just like Ostrich , Kiwi and Elephant Bird , it is part of the order of flightless birds known as Ratites.
The synonym Moa is a reference to a bird that used to live in New Zealand before being wiped out by man. The Moa is extinct, and would have resembled the similarly gigantic and related Elephant Bird of Madagascar.
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