So I've heard.
(This might sound a bit strange... but I am trying to figure out how people listen)
In the following sentence, what do you believe that the subject is?
"In the mountains, which are beautiful, I saw an animal that I had never seen before while riding my new harley bicycle, that I had just updated with a new chain that I bought in town, which is in the shadow of the mountains, that I mentioned are beautiful, and I also hear might be volcanic.