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Unfortunately, they would likely succumb to smoke inhalation. Birds are not very sharp in the dark. They would probably just stay on their roosts until the air quality got bad enough to kill them. It doesn't take much CO to be deadly to birds. They are easily damaged by anything...
So glad you didn't lose any birds. I've heard too many stories about people losing whole barns full of livestock because of heat lamps. I will never use them in my coop as a result.