Mike,
Your retirement escapades and jocular reporting thereof give many of us a needed respite from the chores of living in the north. The mercury may rise above freezing today so I might work on my tan while shoveling the driveway.
Could the weird "Blu-blu" warble have come from the Fish Crow? We don't have them here so I'm not very familiar with their vocalizations. Most of my Corvus conversations are deep baritone croaks with Ravens.
Thanks for reporting.