Favoritos de pupperoni

This sound came from fairly high in a large Douglas fir. It was surprisingly loud, given at several minute intervals for an hour or so in the late morning (shortened here for ease of listening). I assume this is some kind of arboreal rodent. No birds in the area make a sound like this (alarm calls of Catharus thrushes come kinda close, but it's not that). I've never heard this before, and would love to know what it is!

just watched a coyote hunting successfully along the driveway & hedgerow/woods between us and next house!! I heard squawking & scrambling at the edge of the deck & base of bird feeding station, then saw the coyote run off towards the strip of woods & shrubs, then zip out 40 ft. or so farther up (W), then I was heading for the camera and window, coyote came back E maybe 20ft., dove into the woods again, then proudly sauntered out about 20ft. more to the W carrying an unlucky bunny as I got the camera on and ready.
Eastern Cottontail prey is observation: https://www.inaturalist.org/observations/55404708