European Starlings Over Thermal: The First Fall Show
A firsthand October field note from Thermal, California, where European Starlings move like smoke over farmland while hawks watch the fields.
An October flock turns Thermal’s farmland into moving weather—a dark ribbon of European Starlings above the fields, with the Santa Rosa Mountains holding still beyond them.
On October 15, 2025, the morning in Thermal felt cooler than it had in months. The fields stretched toward the Santa Rosa Mountains, and for a moment the eastern Coachella Valley seemed almost motionless.
Then hundreds—perhaps thousands—of birds lifted at once. They folded across the farmland, tightened into a dark band and dropped back into the grass. Hawks watched from power lines and date palms. With my camera in hand, I kept returning to the same questions: Why were the birds gathering now, what were they finding in the fields, and what made the flock move as if it were one animal?
This is a firsthand field note supported by species research. The photographs and video record what I saw; the biological context below explains what the scene can—and cannot—tell us.
- The flock was the morning’s first visible sign of seasonal change, arriving with cooler air over Thermal’s irrigated farmland.
- European Starlings can be present in Southern California year-round. A larger fall flock may reflect seasonal movement or local concentration, but the observation alone does not prove where each bird came from.
- Their repeated drops into short vegetation were feeding behavior. Starlings probe the ground and force their bills open—a technique commonly called gaping—to reach insects and other food.
- Hawks changed the shape of the sky. When a predator approached, the flock compressed, turned and scattered in rapidly shifting formations.
- The ecological story is complicated. European Starlings are introduced, aggressive cavity competitors and agricultural pests in some settings, yet their real effects vary by place and should not be reduced to a single label.
Field note · October 15, 2025
When the Field Started Moving
The first flock looked less like a collection of birds than a ribbon pulled through the air. It expanded above the crops, turned almost edge-on and seemed to disappear, then widened into a dark shape again. A moment later, the birds dropped into the field.
That repeated cycle—rise, fold, turn, settle—made the field feel alive at a scale no single bird could create.
Why Thermal’s Fields Work for Starlings
European Starlings are ground foragers. Cornell Lab describes them moving rapidly across lawns, fields and other short vegetation, probing with a closed bill and then using strong jaw muscles to force it open. That action exposes insects and other invertebrates below the surface.
The irrigated fields around Thermal create exactly the kind of open, short-vegetation setting where this behavior is easy to see. USDA Forest Service research likewise found that starlings preferred short grass without plant litter over taller grass, probably because it improves movement, prey access and visibility.
What I could see clearly was the flock dropping into the vegetation and feeding. What I could not establish from a distance was the exact prey item or whether the mass landing itself was a coordinated tactic. The defensible explanation is simpler: many social birds were using the same productive field at the same time.
A Fall Return—or a Seasonal Concentration?
The morning felt like an arrival, but that impression needs a careful distinction. European Starlings occur broadly across North America, and Southern California supports them throughout the year. USDA notes that local abundance can fluctuate with seasonal regional movement.
So the larger flock may have included birds moving into or through the region, local birds gathering around a favorable food source, or both. One observation cannot resolve the mix. What it does establish is timing: on this cooler October morning, a conspicuous concentration had formed over Thermal’s farmland.
Predator and flock
When the Hawks Moved
Hawks waited along the power lines and in the date palms, quiet counterpoints to the restless flock. When one left its perch, the starlings changed immediately. The loose band tightened, twisted and broke direction. The sky became a storm of small decisions.
Large starling flocks can make it difficult for a predator to isolate one target. Researchers describe rapidly traveling “agitation waves” when a predator approaches; from the ground, those changes can look like dark ripples moving through the flock.
The Complicated Place of an Introduced Bird
European Starlings were introduced to North America in the nineteenth century and are now among the continent’s most numerous songbirds. They are aggressive around nesting cavities and have driven native birds away from sites they want to use. They can also damage crops, consume livestock feed and create problems where very large numbers roost.
But “introduced” should not become a shortcut for inventing effects we did not observe. Cornell notes that concern about cavity competition is well founded while also citing research that found limited measurable population effects across most of the native species studied. The honest story is ecological tension, not a clean hero-or-villain narrative.
Flock shapes and predator responses are easier to understand with a wide view than through a long lens alone.
Record what the birds actually do, then separate direct observation from the biological explanation.
Observe from lawful public access points and never enter agricultural property, block equipment or disturb the flock.
The First Fall Show
By the time the flock settled again, the meaning of the morning had changed. The desert does not announce fall with turning forests. Sometimes the signal is a cooler edge in the air. Sometimes it is the low angle of the sun on the Santa Rosas. That day, it was thousands of dark wings moving like smoke above a green field.
The birds did not need to be rare to be worth watching. Their scale, timing and responsiveness made the familiar landscape feel newly active. For a few minutes, Thermal’s fields became the clearest expression of the season turning.
Frequently Asked Questions
Are European Starlings native to California?
No. European Starlings were introduced to North America in the nineteenth century and reached California in the twentieth century. They are now widespread across the state.
Do European Starlings live in the Coachella Valley year-round?
They can occur in Southern California throughout the year, while local numbers may change with seasonal movement and available food. A large fall flock may combine resident birds with birds moving regionally.
What are starlings eating when they probe agricultural fields?
Starlings eat insects and other invertebrates when available, along with fruit, grain, seeds and livestock feed. In short vegetation they commonly insert a closed bill into the ground and force it open to expose food.
Why do starling flocks twist and ripple when a hawk approaches?
Rapid collective movement can make it harder for a predator to isolate and track one bird. A turning flock can also create visible dark ripples, sometimes called agitation waves, as birds respond to danger.
Where can visitors safely watch birds around Thermal?
Use public roads, established viewing areas and designated wildlife sites, and pull over only where it is legal and safe. Agricultural fields are working private property unless clearly marked otherwise; never enter them without permission.
Sources and field-note methodology
- Cornell Lab of Ornithology — European Starling overview
- Cornell Lab of Ornithology — European Starling life history
- USDA Forest Service — Foraging Behavior of European Starlings
- USDA APHIS — starlings and blackbirds
- National Audubon Society — what makes starlings gather
- Firsthand observations, video and photographs: Mark Miller in Thermal, California, October 15, 2025.
