Animals in fireplace flue
Raccoons, squirrels, birds, bats, and other animals can get into chimneys if there is no cap to keep them out. These animals can bring fleas and ticks into your home, as well as rabies, worms, and other diseases. So animals in the chimney pose a serious health risk. If you see or hear animals in the chimney, call your chimney professional and have them removed. Then have a chimney cap with a screen mesh installed on the chimney to prevent future infestation.
It is also a good habit to keep the fireplace damper (or glass doors) closed, to prevent the animals from getting into the house.
Safety Alert concerning animals in a fireplace
Animals bite! Stay away from a fireplace that might contain an animal.