While a friend and I were seated near a window, dining, we heard a song unlike that of any of the common birds with which we were familiar; it was not loud nor ringing, nor at all like whistling, but the notes were formed into a sweet and somewhat complex bird melody...it required from us only a lifting of the eyes to discover the singer, a Blue Jay, perching outside of the window on the lowest branch of a pine tree.
"The Song of the Blue Jay," by Isabel Goodhue (1919). Click here to read the book online, or download it free, from the Internet Archive.