If ingested, they could cause heavy metal poisoning. Particles may also be included in the smoke. Even better, keep birds out of the room when you have a fire. Smoke is an irritant to us and surely is to our feathered friends. Bathing - Turning on our furnaces often leads to dry air.
Dry air can mean dry skin and dry breathing passages for our pet birds.
Try to keep the humidity up near your birds. And be sure they can bathe frequently. Drafts - It's cold out there. Check windows and doors for leaks. Birds can handle lower temperatures, but a cold draft can make your bird ill.