In our spotted owl surveys here at Olympic National Park over the last 4-5
years, we have had numerous barred owls respond (either vocally and/or by
flying in) to spotted owl calls (human imitations - not tapes). Generally, the
barred owls act more aggressively (boldly?) than spotted owls in their
responses. Whether they are aggressively defending territory or looking to
have a spotted owl for a meal is unknown.

By the way, while we are just starting to analyze our data (with respect to the
incidental barred owl responses), our initial impression is that the frequency
of finding barred owls is increasing significantly. Including sites well into
old-growth stands in the interior of the park (far from man-made 'edges').
This, combined with the perceived aggressive nature of the barred owl doesn't
seem to bode well for the spotteds.

Also, those of you considering trying your hand (or mouth) at calling spotted
owls may be interested to learn that all of our owl surveys are now carried out
during the day (for safety and survey efficiency reasons). Despite daytime
surveys, we still get good responses from spotted, barred and to a lesser
extent, pygmy and great horned (in season and habitat or course). I should
remind you that calling owls (or any wildlife) in a national park is considered
harassment of wildlife and is prohibited. I don't think the forest service has
such a restriction so you might concentrate your calling in the remaining USFS
old-growth. Please don't ask whether we prosecute hooters or pishers.

Roger_Hoffman at nps.gov
Olympic National Park