Animals in your chimney: how to tell what moved in
An open flue is a dry, sheltered, predator free shaft, which is exactly what a lot of South Florida wildlife is looking for. Most homeowners find out the same way: a noise from the firebox that does not belong there. Working out what it is matters, because the safe response is different for a bird, a raccoon and a colony of bats.
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What the sound is telling you
Timing narrows it down fast. Scratching and scrabbling that starts around dusk and carries on into the night usually means a mammal, because raccoons and opossums are nocturnal and they climb down the flue to a ledge above the damper. Rustling and chirping that peaks at dawn and again in the late afternoon is more often birds, and if the chirping is constant and comes in bursts you are probably hearing nestlings being fed.
A fast, dry fluttering right at the top of the flue that repeats at sunset points at bats leaving to feed. A slow scraping that goes on for hours in the same spot, with no calls at all, is often an animal that has fallen in and cannot climb back out. That last one is the urgent version, because a trapped animal will die in the flue and you will find out about it by smell a week later.
What you can check safely from the room
Open the damper only if you are sure nothing is sitting on it, because anything resting there drops straight into the firebox when the plate swings. Stand to the side, open it slowly, and be ready to close it. If you can hear movement directly above the plate, leave it shut and stop there.
Look up the flue with a flashlight from the firebox rather than reaching in. Twigs and dried grass packed into a shelf shape mean a nest. Dark smears down the flue wall, and small dark droppings collecting on the smoke shelf, point at a mammal or at bats. Feathers and white streaking are birds. None of this requires touching anything, and it is enough to tell whoever comes out what they are dealing with.
The things that turn a nuisance into a repair
Nesting material is combustible and it sits in the one place you least want combustible material. Homeowners who light a fire to drive an animal out are the ones who end up with a flue fire, and it is worth saying plainly that smoke does not reliably move an animal down and out. It moves it further up, or it kills it in place.
The second problem is moisture. Droppings hold damp against the flue wall and the mortar behind it, and in a humid climate that speeds up the same deterioration that rain causes. A season of occupation can leave staining and softened joints that were not there before, which is why an occupied flue is worth clearing sooner rather than at the end of the summer.
Why this keeps happening to the same chimney
Almost every repeat case comes down to the same thing, which is that the top of the flue is open. A chimney with an intact cap and a sound screen does not get occupied, and a chimney without one gets occupied again the season after it is cleared. If you have had animals twice, the cap is the fix, not the clearing.
Caps in this part of Miami-Dade have a harder life than the catalogue suggests, because humidity and salt in the air work on the screen and the fasteners. A cap that looks fine from the ground can have a screen that has rusted through on the side you cannot see, which leaves an opening the size of your hand at the top of an otherwise healthy chimney.
What to expect from the visit
The order matters. The flue gets cleared first, then it gets looked at, and then the opening gets closed. Closing the top before the flue is confirmed empty is how animals get sealed in, and that is a worse problem than the one you started with.
If there are young in the nest, timing changes, because in most cases the humane and lawful route is to wait until they can leave on their own and close the top immediately after. It is reasonable to ask about that up front so nobody is surprised by a delay.
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Frequently Asked Questions
Can I just light a fire to get it out?
No. Smoke does not reliably drive an animal down and out of a flue, nesting material burns readily, and a fire lit under an occupied chimney is one of the more common ways a flue fire starts. Leave the fireplace cold until the flue has been cleared.
How do I know if something died in there?
A steady smell that gets stronger in warm weather and does not clear when you air the room out is the usual sign, and it often arrives a few days after the noises stop. That combination, noise then silence then smell, is worth acting on quickly.
Will a cap stop it happening again?
An intact cap with a sound screen is what keeps a flue from being occupied, and it is the reason some chimneys never have the problem while a neighboring one has it every year. If it has happened more than once, the top of your chimney is open in some way.
Is it safe to open the damper to look?
Open it slowly and stand to the side, because anything resting on the plate falls into the firebox when it swings. If you can hear movement directly above the damper, leave it closed.