Any Birders out there?

Sitting at my computer, working on a website I am responsible for our guild, I heard a sound besides the crickets that are the normal background to night's here. I had not heard this in a long time.  Some kind of owl?  We heard them when we first moved into the house over 40 years ago, but not recently.  Does anyone know what it is?  Listen:

Another digital greeting by Smilebox

Please leave a comment if you know. Thanks!