As a person that has surveyed for Spotted Owls using mandated tape playback and a government protocol for several years, I've noticed a change in owl responses as the nesting season progresses. Initially, the territorial "song" is advertised by the male owls in the beginning of the season (Feb-May for various species). But then, as the season progresses to post-fledgling state, you might notice a change in the types of responses. Often times, it is an agitated female that responds. Those variables (female and agitated) naturally change the type of response that one may hear, say in April. Here are examples of what I most commonly hear in the woods right now while doing surveys in the Rogue Valley. Western Screech-Owlhttp://www.allaboutbirds.org/guide/Western_Screech-Owl/sounds- click on the bark and Te Te Do Flammulated Owlhttp://www.allaboutbirds.org/guide/flammulated_owl/sounds- click on the barks & moans Barred Owlhttp://www.allaboutbirds.org/guide/barred_owl/sounds- click on the female solicitation call, but it is amplified and angry like a scream right now. Good birding,Russ NamitzMedford, OR