Birds in Dryer & Bath Vents in Utah

The short version

If birds are chirping in your dryer, bathroom fan or kitchen hood vent, four things decide what happens next: which bird it is, whether the nest holds eggs or young, what time of year it is, and what kind of vent it is. In Utah, starling and house sparrow nests can come out right away. A native bird's nest with eggs or young has to stay until the young fledge. Either way, the duct should be cleared and the opening guarded so the problem doesn't come back.

Which birds nest in Utah vents

The two most common vent nesters are non-native birds, and both like cavities:

• House sparrow. 5 to 6½ inches long and under an ounce. Males have a black throat bib flanked by white. UNL Extension describes the nest as a messy, globular pile of grass, string, paper and twigs that fills the cavity. That is the wad of debris you see sticking out of a vent flap.
• European starling. Robin-sized, about 8 inches and 3 ounces, short-tailed and dark, with a yellowish bill in summer. Starlings nest in cavities, and their nests are much less obvious from outside. A fan-shaped spray of droppings on the wall below a vent is a common clue.
• Rock pigeon. Pigeons nest on sheltered ledges more than inside vents, but they will use the top of a vent hood or a large roof vent.

Native birds use houses too. DWR says swallows build their mud nests in eaves and on the sides of houses, and other native birds that may tuck nests into nooks on a house, such as house finches and house wrens, are federally protected. Identify the bird before you touch the nest.

What the law says

Federal law. The Migratory Bird Treaty Act protects the birds listed at 50 CFR 10.13, which a 2025 Fish and Wildlife Service memorandum says is more than 1,100 species, including their nests and eggs. When the service updated its list of nonnative species the act doesn't apply to (85 FR 21262, April 16, 2020), it named the rock pigeon. It also explained that house sparrows (family Passeridae) and European starlings (family Sturnidae) fall outside the treaties entirely.

Utah law. Utah Administrative Code R657-3b-9 says a person does not need a Utah certificate of registration or a federal permit to kill a house sparrow, European starling or domestic/rock pigeon that is damaging property or gathered in numbers that create a health hazard or nuisance. That applies only if non-lethal control is tried first, all local, state and federal laws are followed, and no birds or plumage are sold. Anyone who takes birds under the rule must send the Fish and Wildlife Service an annual report. For a vent, the non-lethal step of removing the nest and guarding the opening is all that is needed.

In-use versus inactive nests. A Fish and Wildlife Service memorandum dated January 15, 2025 defines an in-use nest as one with viable eggs or nestlings, from the first egg until the young fledge and no longer depend on it. A nest still being built, or one that has been abandoned, is inactive. An inactive nest of a protected bird may be destroyed without a permit as long as nobody keeps the nest or its contents. Destroying an in-use nest, or moving any nest, requires authorization. The person doing the work is responsible for making sure no birds, eggs or chicks are harmed.

Utah DWR enforces this. In June 2019, DWR conservation officers were called to a Lehi business where netting had been put over a nest of American kestrel nestlings in the eaves, cutting them off from their parents. Two nestlings had died, and the Lehi Fire Department helped free the three survivors. "People are welcome to prevent birds from nesting on or in their homes, but you have to do it before nesting season begins," DWR Sgt. Sean Spencer said at the time. If there are eggs or babies, wait until they have left the nest. DWR also notes that it is illegal in Utah to keep wild animals without special permits, so a baby bird can't be taken home.

When Utah birds nest

DWR's spring 2026 advisory, issued March 31, said it is not unusual to find baby birds on the ground at that time of year because many birds are hatching. UNL Extension says house sparrows lay 3 to 9 eggs per clutch, can repeat that up to five times a year starting in early April, and quickly rebuild a removed nest in the same place. Starlings lay 4 to 6 eggs in each of two clutches a year. In most Utah valleys, a vent can be in use from April into late summer. The best time to install guards is September through March, after the last young have fledged and before the next season starts.

Why it matters: fire, lint and mites

The U.S. Fire Administration estimates about 2,900 clothes dryer fires in residential buildings each year, causing about 5 deaths, 100 injuries and $35 million in property loss. Failure to clean was the leading factor (34%), dust, fiber and lint were the most common items first ignited (28%), and these fires peak in January. The USFA report notes that dryer exhaust vents can be blocked by the nests of small birds or other animals, and a vent that cannot exhaust properly can overheat. NFPA's analysis of 2014–2018 data counted about 13,820 home fires a year involving dryers, and found that one-third were caused by failure to clean.

Abandoned nests can also send bird mites into the house. University of Minnesota Extension says bird mites live on starlings, sparrows, pigeons and robins and their nests. When a nest is abandoned they search for new hosts, can enter homes and bite people, but cannot reproduce on human blood and die without a bird host. UNL Extension adds that these birds can carry diseases, including the fungus that causes histoplasmosis, so wear gloves and avoid stirring up dried droppings when removing a nest.

What to do, step by step

1. Stop using the dryer if the vent is blocked, it runs hot or loads take much longer to dry. NFPA says the outdoor flap must open when the dryer runs.
2. Watch from outside to identify the bird and see whether adults are carrying food, which means there are young.
3. Starling, house sparrow or pigeon: remove the nest from the outside, bag it, and clear the duct back to the appliance. Don't push the nest further into the duct.
4. Native bird with eggs or young: leave it. Once the young have fledged, remove the inactive nest without keeping any of it.
5. Guard the opening. UNL Extension recommends ½-inch mesh over bathroom and exhaust vents, but warns that lint can build up on dryer vents. Use a guard made for dryer terminations, and replace hoods whose flaps no longer close.
6. Clean the dryer vent pipe once a year, or sooner if drying takes longer than normal, as NFPA advises.

Who to call in Utah

City and county animal services generally don't remove birds from vents. Salt Lake County Animal Services says it does not provide veterinary care, rehabilitation or removal for wildlife. West Valley City and West Jordan both take part in the county's Urban Wildlife Assistance Program, which is limited to skunks and raccoons. For an injured or orphaned native bird, Utah DWR keeps a list of licensed wildlife rehabilitators, and DWR regional offices answer wildlife law questions. For removing a nest, clearing the duct and guarding vents on a house or apartment building, call us.

City guides: Salt Lake City, West Valley City and West Jordan. You can also browse all of our bird control service areas.

Common questions

Sources

1. Federal Register 85 FR 21262 (Apr. 16, 2020): List of bird species to which the Migratory Bird Treaty Act does not apply
2. eCFR: 50 CFR 10.13, List of migratory birds
3. Utah Admin. Code R657-3b-9: Nuisance bird and mammal species (LII)
4. USFWS Migratory Bird Permit Memorandum MBPM-2-02: Authorizations to take migratory bird nests (Jan. 15, 2025, PDF)
5. Utah DWR: If a nest has eggs or baby birds, leave it alone or face a citation (July 9, 2019)
6. Utah DWR: Found a baby bird on the ground this spring? (Mar. 31, 2026)
7. Utah DWR: Licensed wildlife rehabilitators
8. Utah DWR: Contact us (regional offices)
9. University of Nebraska-Lincoln Extension NebGuide G2024: Urban Pest Birds, Controlling Damage
10. U.S. Fire Administration: Clothes Dryer Fires in Residential Buildings (2008-2010), Topical Fire Report Series (PDF)
11. NFPA Research: Home Dryer Fires, Marty Ahrens (June 2020, PDF)
12. NFPA: Clothes dryer safety tip sheet (PDF)
13. University of Minnesota Extension: Bird mites
14. Salt Lake County Animal Services (wildlife policy)
15. West Valley City: Urban Wildlife Assistance Program
16. West Jordan City: Animal Services FAQ