An unknown sound

["Debbi B" dgbrusco]

During a night hike in a place in Santa Clara county (hills above 
Stevens Creek Reservoir) where we've recently heard Western Screech Owl 
(barking and trilling), Great Horned Owl, and seen a Common Poorwill, we 
heard this sound. Unfortunately, I only got one vocalization, if that's 
what it is, but it was repeated several times, within several separate 
"sentences". See the first file here (LS100400PR):

*http://soundcloud.com/dbrusco*

Any ideas?
-- 
/Debbi Brusco
CA
/












"While a picture is worth a thousand words, a 
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause


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