If you played a lyrebird a clip of R2D2 a few times it would probably start mimicking it perfectly. The males try to impress the females by doing a little dance and mimicking as many different sounds as they possibly can. This includes young males copying the calls of older males, down through generations: there's anecdotal evidence of lyrebirds singing the theme-tune to a radio serial that was canceled decades earlier, while in Tasmania, where the Superb Lyrebird was introduced in the 19th century, people have heard them mimicking the call of the Eastern Whipbird - a bird which is found on the mainland of Australia, but not in Tasmania. (Incidentally, in that clip I posted above you can hear the lyrebird frequently doing the whipbird's call - it's the one with the long sustained note followed by a sudden sharp sound like a whip-crack and then sometimes two or three other quick notes.) I've personally witnessed a Superb Lyrebird mimicking the call of a Lewin's Honeyeater - and being answered by a real Lewin's Honeyeater.
Basically, lyrebirds are fucking amazing.
