Why Birds Pick Your Vents
- The hood gives shelter from rain and predators
- Warm exhaust makes the cavity comfortable in cool weather
- A flap held open by lint, or missing entirely, leaves the door open
- Loose lint at the opening doubles as nesting material
Signs: chirping or scratching near the laundry room or bathroom, twigs and grass at the hood, and a dryer that suddenly takes much longer to dry. For a guided check, use the pests section of the problem checker.
Check the Species Before You Touch a Nest
The Migratory Bird Treaty Act prohibits the take of protected migratory bird species without prior authorization, according to the U.S. Fish and Wildlife Service. A 2004 amendment limits it to species native to the United States, and the Service published an updated list of nonnative, human-introduced species the act doesn't cover in 2020.
| Situation | Next step |
|---|---|
| Nonnative species, such as house sparrows or European starlings | Removal isn't restricted by the act; clear the nest and fix the hood |
| Native species with eggs or chicks | Leave it and contact the U.S. Fish and Wildlife Service or a licensed wildlife professional |
| Species unknown | Photograph the bird and nest, then get it identified before removal |
| Old nest, no birds seen for weeks | Confirm it's empty, then clear and clean the vent |
How a Nest Comes Out of a Vent
Stop the Appliance
Don't run the dryer or fan while the vent is blocked.
Open the Hood
Remove the outdoor cover to reach the nest.
Pull the Nest and Loose Debris
Wear gloves, and bag the material.
Clean the Full Line
Nesting material and lint travel deep into the duct; brush and vacuum it end to end.
Replace the Hood
Fit a hood whose damper closes fully when the appliance is off.
Keeping Birds Out Without a Screen
A screen over a dryer vent clogs with lint, and Section M1502 of the Virginia Residential Code bans screens at dryer terminations. Use a hood with a backdraft damper that closes on its own, keep lint from propping it open, and check it every few months. The dryer vent inspection page shows what a passing hood looks like.
Is Dryer Lint Safe for Bird Nests?
Skip it. Lint soaks up water and falls apart in rain, and it carries residue from detergent and fabric softener. Leaving lint around the dryer hood also invites birds to build right there. If you want to help nesting birds, offer twigs, dry grass or leaves away from the house, and keep the vent itself lint-free with regular dryer vent cleaning.