Why did Australia choose the emu as symbolic bird?

The emu is not an Australian bird symbol or emblem, as Australia does not have any official animal or bird emblem. Each of its states has faunal emblems, but the Commonwealth of Australia as a whole does not.The emu is only seen on the Australian coat of arms. According to the website of the Australian Government, the emu and the kangaroo were chosen to hold the shield on the coat of arms because neither animal has been observed taking a backward step. Whether or not it is true that these animals cannot step backwards has been an ongoing matter for debate, but regardless, it is the reason why the emu was chosen.