The Ku Pteleopsis Hylodendron Humming sounded like C D F D D to me.  Very deep, possibly octave below left-most C on a piano, but for those saying it&#x27;s just noise I&#x27;d say there&#x27;s some signal there.<p>The Bal Gilbertiodendron Dewevrei Singing clip I can&#x27;t pick anything out.  Bit too quiet to tell.