My leghorns are extremely skittish, but all my birds are skittish. They all come running for food, but if I move my hand towards them at all, they are gone. Most of my birds I can only pick up if I trap them in a net first, even those I raised myself. The only exception is the flock of lavender Ameraucanas. They will let me pat them, even the rooster, although they still don't like to be picked up.
Lazy gardener, comfrey was the enemy on my property for quite a while. A neighbor gave some to DH as a welcome when he first lived here, and he stuck it in the corner of the garden. After years of ripping it out, mowing it, and covering it in plastic, it continued it's relentless spread. Finally, I began to methodically dig out every piece of root. It went 3 feet under the ground, throughout a 15 square foot area. In the end, I won, but I threw the roots into the brambles beyond the edge of the lawn, and it's still out there.
Now we have a new weed that is totally choking out the asparagus bed. It is a twining vine, not sure what it is officially called, but the roots are white, go very deep, and are extremely fragile. Every tiny broken piece forms a new plant, and it spreads like crazy. Maybe I can hope the extremely low temperatures will kill that off!
For the record, I closed the pop doors in the coop and I'm running the reptile heater just for a few hours. It might make a little difference, since the coop is insulated. The hoop coop birds will be the guinea pigs in the "how cold can you go?" experiment. The space is way too large and open for a tiny lamp to make any difference. And even though tomorrow it may snow, that flock gets a break and a tropical vacation, every time the sun comes out.