My mother sent me a link to this site with some Australian bird calls. I've heard kookaburras before, but the female Whipbird has quite the call. Click on the green circle below the picture. There are links to other Australian birds.
I'll probably wander back here tomorrow night; I'm off to Yellowstone tomorrow for a belated birthday present. My husband is in charge of the boys while I run around.
Here's another geyser photo to inspire you to visit Yellowstone (again) someday: