An uncapped chimney, to wildlife, is a hollow tree with central heating: dark, sheltered, predator-proof. Every spring across DFW, birds, squirrels, and raccoons take the offer. The good news is they’re terrible at hiding.
The evidence, sense by sense
Sounds. Fluttering and wing-beats: birds. Rapid scratching, daytime activity: squirrels. Slow, heavy movement and nighttime activity, sometimes chittering trills: raccoons. Rhythmic chirping in chorus: chicks, which changes the timeline (see below)
Debris. Twigs, leaves, or nest material on the smoke shelf or dropping into the firebox, construction is underway or complete
Smell. Musky animal odor, or worse, a dead-animal smell, from a creature that entered and couldn’t climb back out. Slick metal flues trap animals; masonry ones let them come and go
Sight. Watch the top of the stack at dusk, repeat visits by the same bird or squirrel is your answer. Chimney swifts entering at dusk look like bats and are federally protected (more in a moment)
What not to do, seriously
Do not light a fire to “encourage them out”. Nests are tinder sitting in your flue, panicked animals dive down into the house as often as up, babies can’t leave at all, and a smoldering nest above a fresh fire is how
chimney-fire calls start. Also skip the DIY pole-and-reach: raccoons defend nests, and
nest removal has legal wrinkles most homeowners don’t know exist.
The one big legal wrinkle: chimney swifts
Chimney swifts, the most common bird in DFW flues, are protected under the federal Migratory Bird Treaty Act: active nests with eggs or young can’t legally be removed. The lawful play is patience (they fledge in a few weeks), then removal, cleaning, and a cap before next season. We’ll confirm what you have and time it right.
What removal actually involves
Identify the species and stage, remove or evict humanely, clear the nest and droppings (both flammable and unhygienic), sanitize, inspect for damage the guest caused, and cap the flue so this is the last time. That’s the whole service, and the cap is the part that makes it permanent. Book the eviction.