UPDATE
Mystery partially solved. Went to see where broody was. She's still in the next-door nest. I made the executive decision to pull the 3 eggs she'd been brooding, candle them, & stick them in the still-active 'bator in case she didn't resume setting. One's pretty porous and appears to be infertile; no movement seen in the other two. The surprise was that while I had the top open, removing the 3 "abandoned" eggs, I tried to touch the broody; she still had her "don't-screw-with-me" game face on. I soon found out why; I spotted a little fuzzy yellow head poking out from under her! First natural-born chick here, ever! Hard to believe that Momma actually moved an egg around a full partition between nest boxes, or that she hadn't kicked out a clear egg. She must have been there a couple hours; chick's totally dry. Now we'll see how well she does raising & protecting a chick in a run full of adults.
g
