Soooo I was feeding the rabbit we adopted (found roaming the countryside, but clearly domestic) - she hops out of her hutch onto my lap to be hand-fed pellets each evening - and there was MOVEMENT inside the hutch...
Six little versions of her have appeared. Perhaps 5 days old. All alive!
I had a heart attack though. Had to call @Saffy in to see what it was, as I had my hands full and was thoroughly freaked out... I figured it was either babies, or a mouse or rat or something had snuck in...