I had to put down a mouse once because a dog had bit it's head it was gross. The vet said put it in a small container like a can with a lid and put it in freezer. It was supposed to fall asleep and then get too cold and die I guess. The mouse was pretty out of it by the time it went in freezer. It was very sad.
Hens go broody when you don’t want them to… and won’t go broody when you do. 