Fairly new to chickens, here. Got four day-old pullets in August, and they're now healthy young chickens. Built a coop and a covered run (snow territory), and the run is surrounded by heavy 1" mesh wire, pretty impenetrable by anything less than a bear. Every morning I go open the pop door, to let the chickens out to the run. Every night I go out (sometimes more than once, if they're hanging out late in the run), and close the pop door behind them, making sure they're safe in the coop. Then I ask myself, "why?" What's conventional thinking, here? Should I even bother closing the pop door at night, if their run is secure? Here's a photo taken during construction. It's finished now, but I keep forgetting to get another photo.