It is worth one's time to memorize this alternate call of a Western Screech-Owl as it is the most often heard vocalization of winter CBCs. An excellent recording of this type of call can be found here....by Oregon's very own Dave Herr. http://macaulaylibrary.org/audio/47543/megascops-kennicottii-western-screech-owl-united-states-oregon-david-herr Good birding, Russ NamitzMedford ************************************The Western Screech-Owls make an interesting barking sound, plus the more typical bouncing-ball song. I think they have been nesting in a treed area along our street, and they seem to follow a nightly routine where they move away from our street then return between 10pm and 5am. - Diana Byrne NW Portland