Around here, people keep ducks and chickens in unheated coops. 

> DO I NEED TO INSULATE MY CHICKEN COOP? 

> There are as many opinions on this subject as there are breeds of poultry and we recommend that everyone research the matter for themselves and choose the option that is best for their situation and their birds. The information we found on the subject seems to support the fact that insulating your coop is probably unnecessary. Many chicken breeds are very cold hardy. Especially the larger breeds with ample feathers. You may be surprised to discover just how well most birds tolerate extreme cold. They will huddle close together in their nest boxes or on their roosts and keep each other warm during the coldest winter weather providing that you flock a coop that is dry, well ventilated, and free from drafts. Make sure your coop has adequate ventilation. Remember, moisture inside the coop is a problem. Especially in the winter. Don’t insulate an unheated coop because moisture will build up inside.

comment: sounds very similar to recommendations for bees

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