Bird–Vehicle Collisions on Prairie Roads: Risks and Prevention

Bird vehicle collisions happen when birds on or near a road are struck by moving traffic. On the prairie, the main causes are birds coming to roadsides for grit, food, water and open ground. Higher vehicle speeds raise the risk. So do busy seasons such as the fledging period and winter. For drivers, the most reliable way to prevent them is to slow down where birds gather and to watch the shoulders and ditches, not just the lane ahead. Road managers can help by planning roadside habitat, mowing, bridges and crossings with birds in mind.

This guide explains what you can notice from the car window or the road shoulder, why it matters, and how to use that knowledge on your next outing.

What are bird–vehicle collisions?

A bird–vehicle collision is any strike between a flying, perched or foraging bird and a car, truck or other vehicle. It is one part of road mortality, the term for wildlife deaths caused by roads and traffic. Researchers count road mortality among the significant human-related causes of bird deaths. Published estimates for North America run into the millions of birds each year, but the exact figures are uncertain.

On open prairie, roads cut through large areas of grassland and farmland. Ditches, fence lines and verges often provide some of the only cover, perches or bare ground for long distances. That makes the road corridor attractive to birds and also dangerous for them.

Why are birds drawn to prairie roads?

Birds use roads and roadsides because these places offer things that are hard to find in the surrounding landscape. Knowing these attractions helps you predict where birds will be.

Grit and road salt

Many seed-eating birds swallow small stones, called grit. The grit grinds food in the gizzard, a muscular part of the stomach. Gravel roads and road shoulders are an easy source. Horned Larks, Snow Buntings, longspurs and sparrows often pick grit from road edges. In winter, de-icing salt can attract finches such as redpolls, Pine Siskins and crossbills to paved roads.

Food on and beside the road

Grain spilled from trucks, seeds from verge plants and insects in roadside grasses all draw birds to the road edge. Animals already killed by traffic attract scavengers such as crows, ravens, magpies, Turkey Vultures and sometimes eagles. These scavengers can then be hit while they feed.

Open ground, warmth and water

Some birds rest or forage on bare, open surfaces. On summer evenings, Common Nighthawks may settle on gravel roads. Swallows hunt the insects that gather over warm pavement. After rain, puddles on shoulders and gravel roads become drinking and bathing spots.

Perches and flight paths

Fence posts, utility poles and wires give hunting birds a view over ditches full of rodents and insects. Kestrels, Red-tailed Hawks and owls often hunt from these perches and swoop low across the road. Birds also cross roads on regular routes, for example between a wetland and a shelterbelt or under a bridge where swallows nest.

Which prairie birds are most at risk on roads?

Bird vehicle collisions on the prairie tend to involve birds that feed on the ground, fly low or hunt over road verges. Common examples include:

Horned Larks and Snow Buntings forage on gravel and shoulders and often flush late, just ahead of a vehicle.
Western Meadowlarks and grassland sparrows use fence lines and ditches for singing and nesting.
Owls such as Short-eared, Burrowing and Barn Owls hunt low over grassy verges, often at dusk or night. Burrowing Owls sometimes nest in road banks and ditches.
Swallows, especially Barn and Cliff Swallows that nest under bridges and in culverts, fly low across the road surface.
Grouse and pheasants, such as Sharp-tailed Grouse and Ring-necked Pheasants, walk across roads and take off with a heavy, low flight.
Scavengers, including ravens, magpies, vultures and eagles, which feed on roadkill.

Which species are struck most often varies by region, road type and season. Your own observations along a familiar route can show you the local pattern.

When is the risk of bird–vehicle collisions highest?

Risk on prairie roads rises when birds are concentrated near roads, inexperienced, or active in low light. The table summarises seasonal patterns that observers commonly notice.

Season	What birds are doing	What to watch for on the road
Spring	Migration and territory setting; males sing from fence posts	Flocks of larks and longspurs on gravel; birds chasing each other across lanes
Early summer	Nesting and feeding young	Adults flying back and forth across the road with food; swallows near bridges and culverts
Late summer	Young birds leave the nest (fledging)	Fledglings that fly weakly and react slowly; nighthawks on gravel at dusk
Autumn	Migration, flocking and grain harvest	Mixed flocks feeding on spilled grain along haul routes
Winter	Searching for grit, salt and exposed food	Snow Buntings, redpolls and finches on cleared, salted or sanded roads; scavengers at carcasses

Across all seasons, dawn and dusk need extra care. Many birds are active then, and drivers see less well.

What road features increase collision risk?

Collision risk depends on the road itself, the habitat beside it and the traffic using it.

Traffic speed and volume

Vehicle speed is one of the most consistent factors linked to bird vehicle collisions. At higher speeds, a bird has less time to recognise the danger and get clear. Busier roads mean more chances of a strike. However, very heavy traffic can sometimes discourage birds from using a road at all.

Roadside habitat

Roadside habitat means the verges, ditches, embankments, fence lines and any shrubs or trees along a road. Habitat that attracts birds right up to the pavement can raise risk. Examples include tall seeding plants, berry shrubs and rodent-rich grass. On the other hand, verges provide real habitat for grassland birds where native prairie is scarce. Good management keeps that value while reducing the danger.

Common risk points

Road feature	Why it raises risk
Bridges and culverts over water	Swallows nest underneath and birds follow the waterway across the road at vehicle height
Wetlands on both sides of the road	Waterbirds and songbirds cross back and forth between ponds
Shelterbelts or shrubs at the verge	Birds fly out of cover directly into the lane with little warning
Gravel roads and sanded shoulders	Supply grit, so ground-feeding birds gather there
Grain haul routes	Spilled grain draws flocks onto the road surface
Low embankments beside grassland	Owls and hawks hunting the verge fly low across traffic

How can drivers prevent bird–vehicle collisions?

Drivers prevent most bird vehicle collisions by lowering speed where birds are likely and by scanning ahead early. Try these steps on your next drive into birding country:

Learn the hotspots on your route. Note the bridges, wetlands, shelterbelts and gravel stretches where you regularly see birds.
Slow down at those places, especially at dawn, at dusk and in late summer when fledglings are about. Stay within safe limits for the conditions and other traffic.
Scan the shoulders and ditches, not just the lane. Birds feeding on the edge often fly up into the vehicle's path.
Watch for one bird telling you about others. A single lark or bunting on the gravel often means a flock is nearby.
Give scavengers time. Ravens and eagles at a carcass may take off slowly and low. Ease off well before you reach them.
Do not swerve or brake hard in ways that endanger people. Human safety comes first. Gradual slowing is safer for everyone.

How do road managers reduce bird–vehicle collisions?

Collision prevention on roads combines habitat management, road design and traffic measures. The evidence for some bird-specific measures is still developing, so results can vary from site to site.

Mowing timing and height. Mowing verges outside the main nesting season can protect ground nests. Keeping a short strip next to the pavement may make birds less likely to feed right at the lane edge.
Planting choices. Avoiding berry shrubs and dense seed plants right beside fast roads can reduce how often birds are drawn to the edge.
Raising flight paths. Fences, screens or tall vegetation at key crossings, such as bridges over rivers, can encourage birds to fly higher over traffic.
Removing carcasses. Clearing roadkill promptly reduces the number of scavengers feeding in the lanes.
Speed management and signs. Lower speed limits or warning signs can be used at known hotspots. They work best where drivers actually slow down.

Do wildlife crossings help birds?

Wildlife crossings are structures built so animals can cross a road safely, such as vegetated overpasses, underpasses and enlarged culverts. Most are designed for mammals, amphibians or reptiles, so flying birds often do not need them. However, ground-dwelling birds such as grouse may use vegetated crossings. Fencing that guides animals to a crossing can also lift some birds' flight paths above traffic. On the prairie, a crossing over a key wetland or travel corridor may benefit birds as well as other wildlife.

What should you do if you find an injured or dead bird by the road?

If you find an injured or dead bird near a road, put your own safety first and avoid handling it unless you know it is safe and allowed.

Park well off the road where you can be seen. Use hazard lights, and wear bright clothing if you have it.
Do not walk into traffic to reach a bird.
Observe from a distance. A stunned bird may recover and fly off on its own after a short time.
For an injured bird, contact a licensed wildlife rehabilitator or your local wildlife agency for advice before you pick it up.
Avoid touching dead birds with bare hands. Diseases such as avian influenza can be present. In many places, keeping native birds or their parts, even dead ones, requires a permit.
Record and report. Note what you saw and share it with a local road mortality or community-science project, if one exists in your area.

How can you record road observations in your field notes?

Field notes on road birds help you understand local risks, and they can support collision prevention where projects collect such records. A useful roadside entry includes:

Date, time and weather. For example, "late August, 20 minutes after sunset, calm and warm."
Location. Use the road name and a landmark, or coordinates if you use a GPS or phone.
Species and number, or the closest identification you can make with confidence.
What the bird was doing. Feeding on gravel, perched on a fence, crossing low or scavenging.
Nearby habitat. Wetland, shelterbelt, bridge, crop field or native grassland.
Traffic and road type. Gravel or paved, and roughly how busy the road was.

Over a season, these notes often show patterns. You may find a particular culvert where swallows cross every evening, or a gravel bend where larks gather each winter. That knowledge helps you slow down at the right moments and gives road managers a clearer picture if you share it.

Preparing for your next prairie outing

A little preparation makes roadside birding safer for you and the birds:

Plan pull-offs where you can stop fully clear of traffic, such as field approaches, wide shoulders or designated viewpoints.
Keep binoculars, a notebook and a high-visibility vest within easy reach.
Carry gloves and the contact number of a local wildlife rehabilitator.
Leave extra time so you can drive slowly through wetlands and bridge crossings without feeling rushed.
Respect private land and roadside nests. Watch from your vehicle when birds are close to the verge.

The road is part of the prairie landscape that birds live in. Notice where they gather, slow down where they cross and write down what you see. Each careful trip helps reduce bird vehicle collisions and deepens your understanding of the birds along the way.