Relative of the ostrich (3)

I believe the answer is:
emu
(Other definitions for emu that I've seen before include "Aussie runner" , "Fast runner in Oz" , "Flightless Aus. bird" , "unit of measurement" , "Large Australian flightless bird" .)
I believe the answer is:
emu
(Other definitions for emu that I've seen before include "Aussie runner" , "Fast runner in Oz" , "Flightless Aus. bird" , "unit of measurement" , "Large Australian flightless bird" .)