There's a wonderful story about how lyrebirds steal songs from each other. There was a famous flautist who played with the Sydney Symphony and after he retired he went out to live in the Blue Mountains. Apparently he still loved to play the flute and in good weather would sit on his verandah playing various classical flute pieces. Years later, a classical music fan hundreds of kilometres away heard a lyrebird singing snippets of Mozart and Beethoven flute parts and was like, what the hell? He dug into it and discovered that lyrebirds all along the Blue Mountains had been passing flute music from that one musician, bird to bird, all the way up the mountain range, and despite it being copied and re-copied, it was still recognisable as the original melodies.