Feral hogs eat just about anything they can find, dig up, or catch, but the bulk of their diet is plant material. Stomach-content studies consistently show that fruits, seeds, leaves, stems, and roots make up the overwhelming majority of what they consume, with animal matter and other items filling in the margins. That simple summary, though, barely scratches the surface. What feral hogs choose to eat shifts dramatically with the season, the landscape, and what happens to be available, and the consequences of their appetites ripple through croplands, forests, freshwater habitats, and native wildlife populations in ways that surprise even researchers.
Plants First, Everything Else Second
When researchers examine feral hog stomachs, the picture is lopsided in favor of vegetation. In a study of feral pigs in a relatively undisturbed ecosystem, plant matter dominated the contents. Fruits and seeds were the single largest food category, followed by leaves and stems, then underground plant parts like roots, tubers, and bulbs. Animal-based foods, including both vertebrates and invertebrates, each accounted for a small fraction of the diet, and mineral matter (soil ingested while rooting) was similarly low.
This plant-heavy pattern holds across continents, from the Americas to Europe to Australia, though the specific plants vary enormously depending on what grows locally. In tropical and subtropical environments, palm fruits and large seeds from canopy trees can dominate. In temperate forests, acorns and other hard mast become staples during autumn and winter. In grasslands, grasses and herbaceous plants fill the role. The thread connecting all of these is that feral hogs are true generalists: they track whatever plant resource is most abundant and nutritious at a given time, rather than specializing in any single food type.
How the Menu Changes With the Seasons
Feral hogs do not eat the same things year-round. Their diet follows the rhythm of plant growth in a remarkably predictable way. Research tracking wild boar use of understory plants in a forest-agricultural landscape in Poland found that aboveground plant parts, particularly grass leaves, dominated during greening and flowering periods in spring and early summer. As autumn arrived and plants began shedding leaves, underground organs became far more important. Herb roots showed the strongest seasonal surge during this shedding period, while grass roots stayed uncommon throughout the year.1PubMed Central. From Leaves to Roots: Seasonal Dynamics of Wild Boar (Sus scrofa) Use of Understory Plant Resources in a Forest-Agricultural Landscape of Central Poland
The pattern makes intuitive sense. In spring, fresh green growth is everywhere and easy to access. By late autumn and winter, those tender shoots are gone, so hogs shift to rooting for energy-dense underground storage organs that plants have packed with carbohydrates for winter survival. This rooting behavior, where hogs use their muscular snouts to churn through soil, is one of their most ecologically destructive habits. It tears up ground cover, damages root systems of plants they aren’t even targeting, and can transform the forest floor into something resembling a freshly plowed field.
Mast years add another layer of variation. When oak, hickory, or beech trees produce bumper crops of nuts, feral hogs gorge on them, and their diet can temporarily swing to being almost entirely hard mast. In lean mast years, hogs compensate by eating more roots, invertebrates, and whatever else they can scrounge, which often means more agricultural raiding.
Crop Damage and What Gets Hit Hardest
Feral hogs are a serious agricultural pest, and the crops they target reveal a lot about their foraging preferences. In South Carolina, researchers tracked wild pig damage to corn and peanut fields throughout the growing season. Corn damage spiked right after planting, when hogs dug up and ate germinating seeds during the seedling stage. Damage then dropped to nearly zero during the mid-growth stages before climbing again during the silk and mature stages, when ears were developing and ripening.2Crop Protection. Timing and extent of crop damage by wild pigs (Sus scrofa Linnaeus) to corn and peanut fields That two-peak pattern reflects how hogs exploit the same crop at different life stages for different reasons: first the calorie-rich seeds, then the mature grain.
Across the Atlantic, a study of crop damage by wild boar in southwestern Poland found that maize accounted for roughly 44% of the total damage area, with various cereal crops making up about 30% and grasslands around 13%.3PubMed Central. Patterns of Agricultural Crop Damage by Wild Boar (Sus scrofa) in South-Western Poland Maize is a favorite target worldwide because the plants produce dense, energy-rich ears at a height that hogs can easily reach, and the fields provide cover. Rice paddies, sugarcane, wheat, sorghum, and root crops like sweet potatoes and cassava also take heavy hits in regions where those crops are grown. Hogs don’t just eat crops cleanly: they trample far more than they consume, which is why economic damage estimates often dwarf the caloric value of what actually ends up in their stomachs.
Animal Prey and Opportunistic Hunting
While plants form the dietary backbone, feral hogs are committed opportunists when it comes to animal protein. They eat earthworms, beetle larvae, snails, and other soil invertebrates, especially during rooting. Research in the French Alps documented patterns of earthworm consumption by wild boar across months and years, finding that earthworms are a consistent part of the diet when accessible.4Wildlife Research. Seasonal and annual variations in earthworm consumption by wild boar (Sus scrofa scrofa L.) In some habitats, soil invertebrates contribute a meaningful share of protein, particularly during seasons when plant foods are nutritionally poor.
Feral hogs also eat vertebrate prey when the opportunity presents itself. They catch and eat small mammals, ground-nesting birds and their eggs, lizards, snakes, frogs, and even fawns of white-tailed deer. They are not efficient predators in the way a coyote or bobcat is, so they rely more on stumbling across vulnerable prey than on active pursuit. Nests on the ground are particularly at risk. On the western Cape York Peninsula in Australia, feral pig predation was the leading cause of marine turtle nest loss, responsible for about 90% of all nest mortality in the study area.5Wildlife Research. Marine turtle nest depredation by feral pigs (Sus scrofa) on the Western Cape York Peninsula, Australia: implications for management Sea turtle eggs are a calorie-rich, defenseless food source that hogs can locate by smell and unearth easily, and the scale of that predation is severe enough to threaten nesting populations.
Ground-nesting birds in the United States face a similar problem. Quail, wild turkey, and various shorebird species all lose nests to hog rooting and foraging. The hogs don’t have to be specifically hunting for eggs; their systematic disturbance of the ground layer simply destroys nests as a side effect of looking for roots and invertebrates.
Scavenging and Carrion
Feral hogs are also enthusiastic scavengers. A broad review of scavenging among invasive species ranked feral pigs as one of the most common vertebrate scavengers globally, alongside red foxes, domestic dogs, black rats, and feral cats.6PubMed. Scavenging with invasive species They will eat dead livestock, deer carcasses left by hunters, roadkill, and even other dead feral hogs. This scavenging habit has practical implications beyond ecology. When hogs consume carcasses of animals that died from disease, they can become carriers and spread pathogens across the landscape. Concerns about feral hogs spreading diseases like African swine fever, pseudorabies, and brucellosis are partly rooted in their willingness to eat infected carrion.
In areas near human activity, feral hogs also raid garbage, compost piles, and supplemental feed set out for livestock or deer. They are not picky. If it has calories and they can access it, it’s food.
Freshwater Foraging
One of the more surprising entries on the feral hog menu is freshwater mussels. Research in Alabama documented feral pigs selectively preying on mussels in river habitats, with a clear preference for certain species. Out of all predated mussels found, the vast majority were a single species (Fusconaia cerina, commonly called a shiny-rayed pocketbook), even though other mussel species were present in similar or greater numbers. Overall, about 28% of experimentally stocked mussels went missing from enclosures, and the pattern of empty shells strongly suggested hog predation rather than natural mortality.7BioOne Complete. Picky Pigs Prefer Pigtoes: Evidence for Species-Selective Feral Pig Predation on Freshwater Mussels
This matters because freshwater mussels are among the most imperiled groups of animals in North America. Many species are already in decline from habitat loss and water pollution. Adding feral hog predation to the mix compounds an already bad situation, especially since hogs seem to target particular species rather than eating mussels indiscriminately. Why they prefer certain species is still unclear, but shell thickness and how deeply a mussel burrows into sediment likely play a role. A large mussel sitting close to the surface of a shallow streambed is an easy meal for an animal that roots through substrate as naturally as breathing.
Forest Seeds and the Mast Connection
Feral hogs consume enormous quantities of tree seeds, and this has measurable effects on forest composition. In an experimental study in the southeastern United States, researchers compared forest plots that excluded hogs with plots where hogs had free access. Large-seeded species known to be preferred hog forage, including hickory nuts, acorns, and tupelo seeds, all responded positively to hog exclusion, meaning more of those seeds survived and germinated when hogs couldn’t reach them.8Elsevier / Forest Ecology and Management. Experimental test of the impacts of feral hogs on forest dynamics and processes in the southeastern US The implication is that feral hog foraging is suppressing the regeneration of certain tree species by eating their seeds before they have a chance to sprout.
This creates a slow-motion shift in forest composition. Trees that produce large, energy-dense seeds are precisely the ones hogs prefer, and they’re also often the species that are most valuable ecologically as food for native wildlife like deer, turkey, squirrels, and bears. Over decades, heavy hog foraging could tilt forests toward smaller-seeded species that hogs ignore, fundamentally changing the habitat for everything else that depends on mast.
Competition With Native Species
Because feral hogs eat so many of the same foods as native wildlife, diet overlap is a real concern. In the Brazilian Pantanal, researchers compared the diets of feral pigs with two native peccary species. They found high diet overlap between feral pigs and white-lipped peccaries, with both feeding heavily on productive, large-seeded palm species and certain fruiting trees. The overlap with collared peccaries, which tend to feed on smaller-fruited plants, was much lower.9PubMed Central. Diet Overlap and Foraging Activity between Feral Pigs and Native Peccaries in the Pantanal
That high overlap with white-lipped peccaries is concerning because feral hogs are larger, breed faster, and are more aggressive. When two species eat the same things, the one that can outcompete the other for food tends to win, and feral hogs have significant advantages. White-lipped peccaries are already declining across much of their range, and direct competition with feral hogs for the same palm fruits and seeds adds pressure that these native herds may not be able to absorb. In North America, the analogous concern involves competition with deer, turkey, and bear for acorns, and with various small mammals for roots and invertebrates.
Fungi, Truffles, and Soil Organisms
Wild boar and feral hogs have a long-standing association with fungi. In Europe, truffle hunters have used pigs for centuries precisely because the animals are naturally drawn to the scent of underground fruiting bodies. In the wild, feral hogs eat a variety of mushrooms and hypogeous fungi (those that fruit below the soil surface). Research in Patagonia documented feral boar consuming both native and introduced mycorrhizal fungi, and the spores they pass in their feces remain viable, meaning hogs function as dispersal agents for the fungi they eat.10Elsevier / Fungal Ecology. Mycophagy by invasive wild boar (Sus scrofa) facilitates dispersal of native and introduced mycorrhizal fungi in Patagonia, Argentina
This dual role as consumer and disperser gets complicated when feral hogs are spreading non-native fungi into new areas. Mycorrhizal fungi form partnerships with tree roots that are essential for forest health, and the introduction of foreign fungal species can disrupt established networks. It is one of the subtler ecological consequences of feral hog foraging, far less visible than a plowed-up corn field but potentially significant for long-term forest ecology.
An Evolving Forager
Feral hogs are not just domestic pigs that wandered off. Genomic research has revealed that feral populations are undergoing active natural selection that sets them apart from both their domestic ancestors and wild boar. A study examining population genomics, olfactory genes, diet, and gut microbiota found that feral pigs have reacquired olfactory abilities that were diminished during domestication, and their gut microbial communities have shifted in ways consistent with adapting to wild food sources.11PubMed Central. Population genomic, olfactory, dietary, and gut microbiota analyses demonstrate the unique evolutionary trajectory of feral pigs In other words, feral hogs are becoming better at finding and digesting wild foods with each generation.
Enhanced smell is particularly important for an animal that roots underground for food. A domestic pig in a barn has little need for the acute olfactory sensitivity that helps a wild boar locate a truffle or a buried tuber through several centimeters of soil. Feral populations, facing the pressure of finding their own food, are recovering that sensory edge. Their gut microbiomes are also diverging from domestic pig profiles and converging toward compositions better suited to breaking down the wild plants, roots, and varied animal matter that make up their diet. This evolutionary trajectory suggests that feral hog populations, left unchecked, will only become more efficient foragers over time.
Why Their Diet Makes Them So Hard to Control
The extreme dietary flexibility of feral hogs is one of the main reasons they are such a successful invasive species. An animal that can eat acorns in October, dig up earthworms and roots in January, raid corn fields in June, scavenge a deer carcass in any month, and supplement with frogs, mussels, and mushrooms whenever those are available is almost impossible to starve out. Seasonal food shortages that would limit a more specialized animal barely slow feral hogs down; they just switch to a different food source.
This adaptability also makes baiting and trapping programs tricky. When natural food is abundant, hogs have little reason to investigate bait stations. Trapping success tends to be highest during periods of natural food scarcity, like late winter in temperate regions, when hogs are more motivated to seek out corn or other bait. Managers who understand the seasonal shifts in hog diet can time control efforts to coincide with the windows when hogs are most likely to respond to bait, but those windows vary by region and year depending on mast production, rainfall, and crop cycles.
Population estimates for feral hogs in the United States alone run into the millions, spread across dozens of states, and the animals are still expanding their range northward and westward. Their ability to eat practically anything organic is the engine behind that expansion. A feral hog dropped into almost any landscape with soil, water, and vegetation can find enough food to survive and reproduce. That is the core challenge for anyone trying to manage them: you are fighting an animal whose grocery store is the entire ecosystem.