recently we found a HUGE rat tunnel beside my chicken coop. we set up the trail camera and discovered this rat is as big as our family cat. seriously! anyway, it has eaten 4 packs of rat poison in the last 5-6 days. how long does it take for it to die? the box says 4 days. i'm thinking there must be more than one. do they usually run in groups or families? i plan to keep out the poison until it stops disappearing.