Chimney Chatter

I'm sitting here in my family room, which is generally pretty quiet but for the occasional airplane overhead. Today, though, I am hearing an owl that distinctly sounds like it is living in my chimney!?! Do owls nest in chimneys? Oddly enough, Kt pointed out to us a couple days ago that one of our pine trees (it actually belongs to our neighbor) is totally dead. It's gone from completely healthy to having almost no needles over the course of this winter. Could the owl be hunting out a new dead tree? Who knows? Very odd, though... So, as I'm writing, I am listening to, "Whoo, whoo, whoo" over and over again! (Maybe this owls likes chipmunks, in which case he can have the chimney!)