Thanks to the generous Tweeters Universe, I think the mostly likely
candidate is a Barred Owl. I was not able to persuade Merlin to take a
chance on an id. (Thanks for the import directions, Kirk.) But both Gary
Bletsch and Dan McDougall-Treacy suggested Barred Owl and when I listened
it sounded like a very soft "hoo-aaw" or the final note of the "Who cooks
for you?" Several people suggested Varied Thrush and that was one of the
possibilities on my list, but 'twasn't quite right. The other suggestion
was Band-tailed Pigeon, which I hadn't thought of at all, and it was close,
as well.

Thanks all--
Carol Stoner
West Seattle, bridgeless day 752