Here is what we know. Whatever-it-is was not stopped by either 1 or 2 bricks on the lid. Whatever-it-is ignored the can of scratch which did not have any bricks on it since both were on the crumbles lid. Whatever-it-is is hypothesized to be stubborn or stupid or both. Or whatever-it-is is on the Atkins Diet and can't eat scratch. Whatever-it-is was not stopped by a closed and locked set of barn doors. Accordingly, whatever-it-is either lives in the barn, contrary to my prior posting, or can fit through the various gaps in the boards that RT and PD might not fit through. Whatever-it-is may be incorporeal. Or it may be some sort of termite thing that can become a larger being such as was seen in Men In Black. We certainly have plenty of termites in there.
I will send J to investigate the underside of the coop as there may be a large excavation near the steps. I never noticed it before, but my attention to detail is currently in a heightened state. I stepped quite swiftly in and out of the coop just in case a pair of sharp, rabid teeth were nearby. Because whatever-it-is doesn't give a damn about the lights being on and my trips to the barn every 3 hours.