OK, so what do the various squirrel calls mean?
So far I've heard:
chk, chk, chk, cherrrrr, cherrrr. chk, chk, chk, cherrrrr, cherrrr.
chuka-chuka-chuka (real quick and staccato-like) To duplicate with the bellows I hold the rigid end and wiggle the bellows back and forth.
And once I heard a squirrel give a very faint, rapid tick-tick-tick-tick call. It was about 10 feet away looking straight at me. I can't duplicate this sound with the bellows call. I can come pretty close by pronouncing the consonant "T" in rapid succession (just a plain "t" sound, not "tee").
So what do the above calls mean? Is the chuka-chuka the warning bark?