I had the same thought. Btw, the French Alouette helos resemble the Model 47, especially at a distance. In fact, sharp eyed viewers will note Allouettes occasionally appear as Bell 47s in episodes of M*A*S*H in long shots. I'm pretty sure the Australian military did not operate Alouettes, but as successful as the aircraft was worldwide, at least a few commerical variants probably made it to Oz.Regarding that first UFO sketch...
It just reminds me of a Bell 47 Helicopter. https://en.wikipedia.org/wiki/Bell_47
They were in service with the Australian Army from 1968 to the early 1970s but there may have been other airframes, either civil or Military Historic Flights still flying after then: