What Do Jackdaws Eat? A Look at Their Omnivorous Diet

Jackdaws eat just about anything they can get their beaks on, from beetles and earthworms to grain, fruit, kitchen scraps, and the occasional egg raided from another bird’s nest. They are true omnivores whose diet shifts with the seasons, the landscape, and whatever opportunity presents itself. That flexibility is central to why jackdaws thrive across such a wide range of habitats, from open farmland to the centers of busy cities.

The Core Diet on the Ground

If you watch a jackdaw foraging on a lawn or a pasture, most of what it picks up will be invertebrates. Beetles, caterpillars, spiders, flies, ants, and earthworms make up a large share of their diet during the warmer months. Jackdaws probe soft soil and leaf litter with quick jabs of their relatively short, sturdy bills, flipping debris aside to expose prey underneath. They also take advantage of freshly mown grass or recently plowed fields, where invertebrates are suddenly exposed.

Seeds and grain are the other staple. Jackdaws eat cereal grains like wheat and barley, weed seeds, and whatever fruits or berries are in season. Elderberries, cherries, and other soft fruits feature regularly in late summer and autumn. When animal protein becomes scarcer in winter, plant material takes over as the dominant food source, though jackdaws will still scavenge animal matter whenever they find it. This ability to toggle between animal and plant food depending on what’s available is the hallmark of their feeding strategy.

How Diet Changes with the Seasons and the Farm Calendar

Jackdaws don’t just eat different things in different months; they actively shift where they forage based on agricultural rhythms. Research tracking jackdaw movements over a full annual cycle found that they feed mainly in grasslands year-round, but they also move into cropland at specific, predictable times. During the spring sowing period, when maize seeds are freshly planted and exposed, jackdaws forage opportunistically in maize fields. Later, during cereal harvesting in summer, they switch to cereal fields, taking advantage of spilled and exposed grain.¹ These seasonal shifts aren’t random. The spring crop-raiding coincides with the early breeding period, when pairs need extra energy, and the harvest-time foraging coincides with the post-fledging period, when parents and newly independent young are feeding heavily.

Grassland remains the backbone habitat because it offers a reliable, year-round supply of soil invertebrates and weed seeds. Cropland, by contrast, is a bonus resource that jackdaws exploit when the timing is right. This pattern of a stable base supplemented by seasonal bonanzas is typical of successful generalist feeders.

What Jackdaws Feed Their Chicks

Adult jackdaws can get by on a mixed diet that includes plenty of grain and plant matter, but their nestlings need something richer. Growing chicks require high-protein food, and parents focus heavily on insects and other invertebrates during the breeding season. Caterpillars, beetle larvae, leatherjackets (crane fly larvae pulled from turf), and spiders are among the prey items brought back to the nest most frequently. Parents may also carry small snails or other soft-bodied invertebrates.

This protein demand during the chick-rearing phase is one reason why the timing of breeding matters so much. Jackdaws that breed in sync with peak invertebrate abundance tend to raise more chicks to fledging. When the insect supply is poor, either because of weather or habitat quality, chick survival drops. The reliance on invertebrate protein for nestlings is a constraint that applies even to a bird as flexible as the jackdaw, and it becomes especially relevant in urban environments where insect availability can be limited.

Eating in the City

Jackdaws are one of the bird species that have adapted well to urban living. They nest in buildings, chimneys, and church towers, and they readily exploit human food waste. Bread, chips, discarded fast food, and scraps from bins and outdoor dining areas all end up in a city jackdaw’s diet. Research on corvids in urban and rural areas found that species including jackdaws approached objects made from human litter more quickly in urban settings than in rural ones, suggesting that urban birds learn to associate human refuse with food.²

But urban abundance comes with a catch. Human food waste tends to be heavy on carbohydrates and fats while being low in the protein that breeding birds and growing chicks need. A study of urban jackdaw breeding found that although cities provide new nesting sites and plentiful human waste, the poor protein content of that waste appears to limit breeding success.³ Urban jackdaws may look well fed, yet their chicks can struggle compared to rural counterparts that have access to invertebrate-rich grassland. The calories are there, but the nutritional quality isn’t always right for raising young.

This is a pattern seen in other urban-adapted birds too. The ability to survive on junk food does not equal the ability to thrive on it, and jackdaws living in dense city centers may produce fewer fledglings per nest even though adult survival is fine. Pairs that nest on the urban fringe, within flight distance of parks or farmland where they can collect insects, tend to do better than those stuck deep in concrete.

Scavenging and Opportunistic Predation

Beyond their routine diet of invertebrates, seeds, and scraps, jackdaws will take advantage of food sources that many people don’t associate with them. They eat carrion when they find it, picking at roadkill or joining other corvids at carcasses. They steal eggs from the nests of smaller birds and occasionally take very young nestlings. They visit bird feeders readily, eating sunflower seeds, peanuts, and fat balls. They pick through animal dung on pastures, targeting the insects and undigested seeds inside it.

Jackdaws are also known to hang around livestock, especially sheep and cattle. They perch on the backs of grazing animals and pick off ticks and other parasites, a mutualistic arrangement similar to what oxpeckers do in Africa, though on a much smaller scale. They also exploit the insects disturbed by grazing hooves. In coastal areas, some jackdaws forage along the tideline for small crustaceans, shellfish fragments, and marine invertebrates. The sheer breadth of their diet is hard to capture in a single list because they eat whatever the local environment offers.

Why Jackdaws Don’t Hoard Food Like Other Corvids

Many corvids are famous for caching food, storing nuts, seeds, or meat scraps in hidden locations and retrieving them later. Jays and ravens, for example, have impressive spatial memories that let them locate hundreds of cached items weeks after hiding them. Jackdaws are different. They hardly cache food at all, and experiments comparing their memory skills to those of ravens found that jackdaws performed far less accurately when asked to relocate hidden food items. Ravens remembered cache locations well above chance, while jackdaws did not, and jackdaws also revisited already-inspected sites more often, suggesting weaker spatial memory for this task.⁴

The researchers concluded that strong observational spatial memory is linked to a species’ reliance on food caches rather than to social complexity per se. Jackdaws are highly social birds, living in stable pair bonds within large colonies, but they don’t depend on cached food to get through lean periods. Instead, they rely on their ability to find fresh food daily across a wide range of habitats. Where a raven might prepare for scarcity by hiding surplus food, a jackdaw simply goes looking for something new to eat tomorrow. This distinction shapes the way they interact with their environment: jackdaws are foragers of the present moment, not planners for the future, at least not in the food-storage sense.

Jackdaws as Accidental Gardeners

Because jackdaws eat so many berries, fruits, and seeds, they inevitably become seed dispersers. When a jackdaw swallows an elderberry or a cherry, the seeds pass through its digestive tract and get deposited elsewhere, sometimes far from the parent plant. A review of seed dispersal by European corvids found that the corvid family as a whole disperses a remarkable number of plant species. Across studies, 157 plant taxa from 42 families were identified as being dispersed by corvids through their digestive tracts, with additional species dispersed through scatter-hoarding.⁵

While jackdaws are not the most prolific seed-dispersing corvids (jays, with their acorn-hoarding habit, get most of the ecological credit), they contribute to plant dispersal in ways that often go unrecognized. Their habit of foraging across multiple habitat types, from woodland edges to pastures to gardens, means they carry seeds between environments that might not otherwise be connected. A jackdaw that eats hawthorn berries in a hedgerow and then defecates while roosting on a church tower in the next village has just moved those seeds across a landscape gap. This ecological service is modest on a per-bird basis but adds up across the large, stable populations that jackdaws maintain in much of Europe.

Conflict with Agriculture

The same opportunism that makes jackdaws ecologically versatile also puts them in conflict with farmers. Their habit of pulling up freshly sown maize seeds is a well-documented source of crop damage, and their presence in cereal fields at harvest time can reduce yields. Tracking data confirms that jackdaws specifically target cropland during sowing and harvest periods, suggesting these visits are deliberate rather than incidental.¹

The scale of the problem varies by region and crop type. In areas with large jackdaw colonies close to arable land, newly sown maize can suffer significant losses. Farmers have used various deterrents over the years, from seed coatings that taste unpleasant to visual scarers and acoustic devices. The effectiveness of most of these measures is short-lived because jackdaws, like other corvids, are quick to learn that a novel threat isn’t actually dangerous. A scarecrow works for a day or two; after that, jackdaws perch on it.

On the other hand, jackdaws also provide a service to agriculture by consuming large numbers of pest invertebrates. Leatherjackets, wireworms, and various beetle larvae that damage crops and turf are all staple jackdaw food. The net economic impact of jackdaws on farming is genuinely ambiguous and depends heavily on local context. A colony next to a maize field is a headache; a colony next to a sheep pasture is eating parasites and pest larvae and causing no crop damage at all.

How an Omnivorous Diet Shapes Physiology

Eating a wide range of foods, including animal tissues from various trophic levels, exposes birds to a wider range of environmental contaminants than a specialist diet would. Research into how different bird species metabolize such compounds found that omnivorous species had higher activity of certain liver enzymes involved in breaking down toxins. Among the species tested, jackdaws, classified as omnivorous alongside gulls and magpies, showed measurably higher detoxification enzyme activity compared to species with more restricted diets like coots and sparrows.⁶ There was a statistical correlation between how omnivorous a species was and how active its detoxification pathways were.

In practical terms, this means jackdaws are biochemically equipped to handle the diverse and sometimes contaminated diet that comes with being a generalist feeder. A bird that eats insects from treated farmland, berries from roadside hedges, and scraps from a city dumpster encounters a cocktail of pesticide residues, heavy metals, and organic pollutants. Having more active detoxification enzymes doesn’t make jackdaws immune to these exposures, but it does give them a physiological buffer that a more specialized feeder would lack. It’s one of those quiet adaptations, invisible to anyone watching a jackdaw on a lawn, that helps explain why generalist feeders persist and even expand their ranges in human-modified landscapes.

What to Feed Jackdaws in Your Garden

If you enjoy watching jackdaws and want to attract them to a garden feeder, they’re not picky. Unsalted peanuts, sunflower hearts, mealworms, and suet or fat balls are all readily taken. Jackdaws will also eat kitchen scraps like cheese, cooked rice, and small pieces of fruit. Avoid anything salty, heavily processed, or containing chocolate or caffeine, as with any wild bird feeding.

A ground feeder or a platform feeder works best because jackdaws prefer to land on a flat surface rather than cling to a hanging feeder designed for smaller birds. They’re also comfortable eating directly from lawns, so scattering mealworms or seed on short grass will attract them. Keep in mind that jackdaws rarely come alone. They forage in pairs or flocks, and if one finds your feeder, you’ll soon have a dozen visitors. If you also want to feed smaller species without competition, use a caged feeder that jackdaws can’t access alongside the open platform you offer them.

One thing garden feeders can provide that natural foraging sometimes can’t, especially in urban areas, is consistent protein. Given the evidence that protein-poor urban diets limit breeding success, offering mealworms or insect-based foods during the spring nesting season could genuinely help local breeding pairs raise healthier chicks. It’s a small intervention, but it addresses a real nutritional gap for city-dwelling jackdaws.