European starlings are one of the most destructive invasive bird species in North America, and controlling them requires a combination of exclusion, habitat changes, and in some cases, lethal methods. Because starlings are not protected by the Migratory Bird Treaty Act, property owners and farmers have more legal flexibility to manage them than they do with native birds. The best approach depends on the scale of your problem: a few starlings nesting in your building vents call for different tactics than thousands descending on a cattle feedlot.
Why Starlings Cause Serious Problems
Starlings don’t just eat livestock feed. They selectively pick out the highest-energy components, specifically the starch and fat-rich portions of mixed rations. Research from the USDA’s National Wildlife Research Center found that starling-consumed cattle feed dropped from 29.3 to 27.7 megacalories of net energy per day for a dairy cow producing about 32 kg of milk daily. That selective feeding means the remaining feed is nutritionally degraded, not just reduced in volume.
Disease is the other major concern. Starlings carry and spread Salmonella enterica through livestock feed bunks and water troughs. A study at a concentrated animal feeding operation in the Texas Panhandle found that after starling control operations, Salmonella contamination disappeared from feed bunks and substantially declined in water troughs. At a nearby reference facility where no starling control was performed, contamination increased over the same period. While the study didn’t find a reduction in Salmonella already present in the cattle herd, removing the ongoing contamination of feed and water is a meaningful step in disease management.
Feed and Habitat Modifications
The most effective long-term starling control starts with making your property less attractive to them. These changes don’t require permits or special equipment, and they work around the clock without maintenance.
Feed form matters enormously. Starlings can only swallow items smaller than about half an inch in diameter. Switching to feed cubes or blocks larger than that threshold cuts access dramatically. Research confirmed that pellets 0.95 cm (roughly 3/8 inch) or larger inhibited starling consumption by 79% or more. On the flip side, 3/16-inch pellets are the worst option: starlings eat them six times faster than granular meal. If you’re feeding protein supplements alongside silage, mixing them thoroughly limits the birds’ ability to pick out the high-value components.
Feeding schedule adjustments help too. Starlings prefer to feed in the morning and early afternoon, so delaying feeding to late afternoon or even nighttime reduces exposure. If feed must be available during peak starling hours, covered feeding areas like open sheds are less attractive to the birds than open-air troughs. Ground feeding is essentially an open invitation and should be avoided entirely.
Water management is often overlooked. Starlings are strongly attracted to water sources, so draining unnecessary pools around livestock operations makes a noticeable difference. For livestock waterers, adjust the water level so it’s too low for starlings to reach from the rim but too deep for them to stand in.
Clean up spilled grain promptly and store grain in bird-proof facilities. Use bird-proof livestock feeders where available: flip-top pig feeders, lick wheels for liquid cattle supplement, and electronic-release feeders for expensive high-protein rations all limit starling access.
Physical Exclusion With Netting
Bird netting is the most reliable way to keep starlings out of enclosed or semi-enclosed spaces like warehouses, loading docks, barns, and building eaves. Mesh size is the critical specification. A 1-1/8 inch mesh effectively excludes starlings, pigeons, and larger birds. If you also need to block sparrows, step down to 3/4 inch mesh, which stops all bird species. A 2-inch mesh will not work for starlings, as they can pass right through it.
Netting works best when installed taut with no gaps along edges. For building openings like vents, eaves, and rafters, properly installed netting provides a permanent solution that requires only periodic inspection for damage.
Trapping
Live trapping can significantly reduce local starling populations, particularly at roost sites. A four-chamber, basket-style starling trap developed and tested in Omaha, Nebraska, proved instrumental in reducing the downtown roosting starling population by nearly 90%. Trap placement near known roosting or feeding sites is critical to success, and using decoy birds inside the trap draws others in.
Trapping works best for defined, localized populations. If you’re dealing with thousands of birds spread across a large agricultural operation, trapping alone is unlikely to keep pace with the problem, though it can complement other methods.
Chemical Control With DRC-1339
For large-scale infestations at livestock feeding operations, DRC-1339 (sold as Starlicide) is the primary chemical control tool. It’s a restricted-use product, typically applied by USDA Wildlife Services or under their guidance. The compound is highly toxic to starlings and blackbirds: a single treated pellet contains a lethal dose. It’s far less toxic to most other birds, mammals, and avian predators. Because the toxicant is almost fully metabolized before death, scavengers that eat dead starlings face minimal secondary poisoning risk.
DRC-1339 is a slow-acting agent. Death occurs 24 to 72 hours after ingestion, never in less than three hours even at very high doses. This delay is intentional. It prevents other starlings from associating the bait site with danger, which would cause bait shyness and undermine the entire effort.
How Baiting Programs Work
A proper DRC-1339 program follows a structured sequence. First, you assess the situation: identify which species are present, estimate flock size by watching flightlines from roost sites in the early morning, and observe whether birds are feeding from troughs or on the ground. Feed loss can be estimated using the formula: number of starlings (to the nearest thousand) multiplied by the fraction feeding from troughs, multiplied by the cost of feed per pound, multiplied by 0.0625 pounds consumed per starling per day.
Next, check whether your state requires additional permits or registration beyond federal authorization. Purchase fresh product, as its effective shelf life in storage is about six months. One 50-pound bag of pre-diluted Starlicide Complete (already mixed at a 1:9 ratio of treated to untreated pellets) covers roughly 10,000 starlings using the lot.
Prebaiting is essential. For three to five days before using treated bait, set out untreated pellets of similar size and shape near feeding sites, placed where livestock can’t reach them. Options include unused feed troughs, rubber tubs on rooftops, or the beds of farm wagons. For very large populations exceeding 100,000 birds that feed on the ground, broadcast application at 20 to 50 pounds per acre on dry or frozen ground is more practical. Monitor consumption during prebaiting to confirm the birds are taking it reliably before switching to the treated product.
It’s worth noting that DRC-1339 is largely ineffective on sparrows and somewhat less effective on blackbirds than on starlings. The poultry pellet carrier used as bait is naturally preferred by starlings over most other bird species, which adds another layer of target specificity.
Legal Status of Starlings
European starlings are classified as an invasive species in North America and receive no federal protection under the Migratory Bird Treaty Act. This means you do not need a federal permit to remove them, their nests, or their eggs. However, state and local regulations vary. Some states require permits for certain control methods, particularly chemical agents, or restrict discharge of firearms in residential areas. Check your state wildlife agency’s rules before starting any control program, especially one involving toxicants or trapping.
Native cavity-nesting birds like bluebirds and woodpeckers can be mistaken for starlings at a glance, and those species are federally protected. Accurate identification before taking action is essential.