From Vermont to California
I send to you, a special thought that your sweet birdie will return to you quickly. I am sure you will be anxious until he returns. I once lost a cat for months - then she showed up on a sidewalk, half alive. We managed to revive her and she lived to be 21. She had a tag on, but must have stayed to herself, only coming out when she was near the end. She was my first cat - escaped out a window, over a roof and down. My story had a good ending, as I hope yours will too!
Prayers and luck.
SAS