Recorded in rural South Wales, UK, last September, nobody I’ve played it to can tell what it is (and Merlin didn’t know either)
https://drive.google.com/file/d/1TwEW5eprcyu8PtiOfxdwc_8hdDLn25wV/view?usp=drivesdk
(Apologies for the Drive link but I couldn’t find an easy way to share audio files on here directly)
This could also be a squirrel. Their alarm calls are close to this. Example.
Oh my god I think that’s it!
Looked up some other examples too and yeah it sounds very similar, I never knew they could make that noise
Glad to hear you figured it out. I frequent a cemetery where there are thousands of squirrels and you’ll hear them make all kinds of noises. Adorable creatures, but they eat all the damn bird seed!