I would agree with 50-45-1 ... the best defense is a secure coop.
For weasels, their killing instinct is triggered by movement — In a chicken coop, the weasel is unable to stop itself from killing.
First, the wild, squawking and flapping movement of the chickens triggers the instinct...
How sad. I can imagine how disturbing it was to find your flock gone. A weasel will slash a chicken's head/neck and drink the blood. They do not normally eat the meat or take the chicken with them.
We rotate our pasture a 1/4 of an acre at a time with an electric poultry fence (from Premier...
Sorry to hear about your issue. We purchased 40 Red Ranger meat chicks from Tractor Supply on March 21st and started losing 2 birds per day. We started to lose two birds per day. Tractor Supply had no explanation. We went through the "checklist" for chicks (heat - we monitor with a digital...