interesting owl sound

["Dan Dugan" dandugan_1999]

When I was out at the Lodi Crane Festival with Paul Matzner in
November, we went out to the area called "The Mound" on Woodbridge
Road to watch the evening fly-ins of multiple species to a marsh.
Just after dark we saw an owl cruising around, and heard an
interesting call neither of us had heard before:

http://www.dandugan.com/downloads/Lodi-Owl%20Ticking.mp3

Anybody know what this is? I recorded for an hour and it only happened once=
.

Here's a sample from there of a flock flyover with interesting wing sounds:

http://www.dandugan.com/downloads/Lodi-Wings%20Buzz%20Overflight.mp3

-Dan Dugan