I have a lone rooster in a coop by himself. We have a red heat light in it as it's been -30 F here. We have weasel tracks that we've been noticing since mid December. No tracks have been found by the other coop with the hens (coop is about acre away). We have wood piles by rooster coop and lots of mice usually (no mice have been found in traps since December) but now we see the weasel tracks back and forth between wood piles and going under rooster coop. It hit -40F for a week. Only one set of weasel tracks into/under? Coop at the beginning of the week. No activity during the very cold spell. Last two weeks -30 again, weasel tracks and looks like weasel may be living under coop but I notice there's snow wiped away from a spot under coop door that's about 1/2" high and tracks leading to it. Run door got left open by accident one night. (I open it during <-20F days) Last 3 mornings I notice weasel tracks (only one set) going to that opening in coop door. It's obvious something is crawling through as snow/shavings are cleared away. It's not mice tracks plus feed isn't disappearing anymore than usual. My rooster is fine. They can't be living together during the cold nights can they?? It's crazy.