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I have 4 hens : that's it. They all 4 stay out. Nothing new or unusual in the coop. I even put treats in there one night and nope, outside they are.
I'm baffled. We have always had a low light in the coop. We even lowered the wattage thinking maybe they want it darker. They are freeing me out. And nothing bad has happened in the coop.
Once they start a new habit, you may have to re-train them into going back into the coop.
1st) Try raising the wattage of the light in the coop. You might get lucky and they will return to the coop on their own seeking the security of the light.
If raising the wattage of the light doesn't work, then you may have to carry all 4 hens to the coop at night.
Wait until it is too dark for them to venture back out into the pen. When re-training the hens like this, you will have to be consistent and do it every night for a week or so.
I have ONE group of birds that flatly refuses to go to the coop at night. They want to sleep on top of it! I have carried them to bed every night for months.
My alternative will be to block off the top of the coop so that they can not roost them. You may have to do some blocking of your own if the first two ideas don't help.