A thump in the night...

Last night we were in the darkened atrium watching The Rings of Power on Amazon Prime when suddenly, right in the middle of a very tense scene surrounded by orcs, there was a thud followed by thumping up on the roof...

We were startled, turned on some outside lights, and went up to the loft to close the ventilation windows.  In the loft I could hear whatever it was cross from the east side all the way across to the west side as I was closing windows right below it...

Still have no idea what it was.  Our roof is a high-ceilinged 2-stories without external access except to flying creatures.  There are no squirrels or raccoons here.  There are monkeys in nearby mountains but I've never seen any in our little valley and the nearest tree is much too far a leap.  Don't know what kind of bird it could have been thumping around on an open roof in the middle of the night, but that's the most probable answer so far.  The preferred answer would be a flying squirrel gliding down from the surrounding cedar trees.  They do exist but they are rare and I've never seen one.  I would love to add flying squirrels to the menagerie that we have somehow organically developed here over the past few years--
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Let it be a flying squirrel.  Please not goblins.  nor monkeys.
Fluffy Flying Squirrels would be delightful.  (I think)

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UPDATE:
Climbed through the ventilation windows onto the roof this afternoon to investigate during the daylight...  I'm not Aragorn, but I'm pretty observant and I found nothing of interest to report.  So we are left with a mystery to be solved another time...