" He thinks they may also imitate the sounds of birds that are no longer around. He thinks the sounds of extinct birds are passed down the years from mockingbird to mockingbird... He says when a mockingbird sings, for all we know it's pitching fossils into the air. He says who knows what songs of ancient creatures we may be hearing out there. "

― Jerry Spinelli , Stargirl (Stargirl, #1)