I remember that we had a weasel get in one time when I was just a tow head. Killed about 7 hens as I recall. Dad found the weasel's access and plugged it up with cement. Had to shoot the weasel with his old .22 rifle. I think they like to drink the blood. At least that's what my folks said.
Every once in a while we'd get a hen that would get broody and wouldn't get off of the nest. No problem getting the eggs but she'd peck until she'd draw blood. We had what we called a "cluck box" that sat on the floor, about the size of a chicken crate. We'd stick her in that for a few days with feed & water and she wouldn't be broody any more.