Rabbits occupy a surprisingly central position in the ecosystems where they evolved, functioning simultaneously as a primary food source for dozens of predator species, as soil engineers that reshape the ground beneath them, and as seed dispersers that carry plants into new territory. In the Mediterranean basin, the European rabbit is considered a keystone species whose population swings ripple through entire food webs. But where rabbits have been introduced outside their native range, many of those same ecological roles become destructive. The story of the rabbit in its ecosystem is really two stories, one about irreplaceable ecological contribution and one about invasion, and understanding both matters for conservation decisions being made right now.
Feeding an Entire Predator Community
In the Iberian Peninsula, the European rabbit sits at the base of a food web that supports an extraordinary number of predators. A wide range of apex and mesopredators actively consume rabbits there, and the critically endangered Iberian lynx is so dependent on them that it cannot shift to alternative prey when rabbit numbers fall.1Scientific Reports. Disease-mediated bottom-up regulation: An emergent virus affects a keystone prey, and alters the dynamics of trophic webs That is a remarkable level of dietary specialization for a cat-sized predator, and it makes the lynx’s survival almost entirely contingent on rabbit health.
The predator community that depends on rabbits extends well beyond the lynx. Field surveys have found that among 17 raptor species known to kill or scavenge rabbits, both the number of species present and the total number of individual raptors correlated with rabbit abundance. Species of the highest conservation concern, including the Spanish imperial eagle, showed the strongest association.2Biological Conservation. Rabbits as a keystone species in southern Europe In practical terms, a landscape with abundant rabbits hosts a richer and more numerous raptor community than one without them. This is not a subtle statistical pattern; it is a visible difference in the skies above those landscapes.
The relationship works in both directions. The Iberian lynx, as the apex predator, enforces top-down control over mid-level predators like red foxes, Egyptian mongooses, and common genets. That suppression of mesocarnivores indirectly benefits rabbit populations by reducing predation pressure from smaller hunters.1Scientific Reports. Disease-mediated bottom-up regulation: An emergent virus affects a keystone prey, and alters the dynamics of trophic webs Lose the rabbits, and you lose the lynx; lose the lynx, and the mesocarnivores surge, further hammering whatever rabbits remain. The whole structure is self-reinforcing in both growth and collapse.
What Happens When Rabbit Populations Crash
This interconnected web has been tested repeatedly by disease. The emergence of a variant of rabbit hemorrhagic disease virus in the Iberian Peninsula caused severe declines in wild European rabbit populations. Because rabbits serve as primary prey for endangered predators like the Iberian lynx and the Spanish imperial eagle, and also act as ecosystem engineers through grazing and seed dispersal, these virus-driven crashes triggered cascading effects throughout the food web and altered Mediterranean habitats.3PubMed Central. Ecosystem effects of variant rabbit hemorrhagic disease virus, Iberian Peninsula
The cascade follows a predictable but damaging sequence. Rabbit numbers drop. The lynx, unable to switch prey, declines in turn. With fewer lynx patrolling the landscape, mesocarnivore populations are released from top-down control.1Scientific Reports. Disease-mediated bottom-up regulation: An emergent virus affects a keystone prey, and alters the dynamics of trophic webs Those mid-level predators then increase their own pressure on remaining rabbits and on other small prey species that had previously benefited from the lynx keeping foxes and mongooses in check. The result is a restructured community that can be difficult to reverse even after the disease passes, because the predator relationships that once stabilized the system have been dismantled.
For conservationists trying to save the Iberian lynx, this means that rabbit management is not a secondary concern. It is the primary one. Captive breeding programs for lynx are limited in usefulness if there are not enough rabbits on the landscape for released animals to eat. Some recovery programs now include direct rabbit population management alongside lynx reintroduction.
Digging and Reshaping the Soil
Rabbits are ecosystem engineers in the most literal sense: they physically restructure the ground. Their foraging pits and extensive warren systems change the soil surface, drainage patterns, and microclimatic conditions of the landscape they inhabit. In temperate grassy woodlands, research on animal foraging pits found that they had a strong moderating effect on soil surface temperatures, with digging pits reducing the daily temperature swing by up to 25°C compared to the exposed soil surface. Over three-quarters of simulated pits remained visible after two years, meaning the physical changes rabbits make persist long after the animal has moved on.4PubMed Central. Effects of digging by a native and introduced ecosystem engineer on soil physical and chemical properties in temperate grassy woodland
The temperature buffering effect matters more than it might sound. A shallow pit that stays cooler during the day and warmer at night creates a microhabitat where seeds can germinate, insects can shelter, and moisture lingers longer than it would on flat, sun-baked ground. In arid environments, these effects extend to soil chemistry, concentrating nutrients in the disturbed patches. In temperate systems, the research suggests the primary engineering role is physical and microclimatic rather than chemical.4PubMed Central. Effects of digging by a native and introduced ecosystem engineer on soil physical and chemical properties in temperate grassy woodland
Warren sites themselves are a different story. In semi-arid Australian woodland, rabbit warrens were found to have significantly less stable soil, with reduced dry and water-stable aggregation compared to undisturbed ground nearby. The plant communities on and around warrens were substantially less diverse and species-rich than adjacent areas.5Journal of Arid Environments. The impact of warrens of the European rabbit (Oryctolagus cuniculus L.) on soil and ecological processes in a semi-arid Australian woodland So the engineering cuts both ways: foraging pits can create favorable microsites, but concentrated warren activity degrades the soil and simplifies plant communities directly around it. The net effect depends heavily on whether you are looking at a native or an introduced population, and how dense the rabbits are.
How Rabbits Compare to the Diggers They Replace
In Australia, where European rabbits were introduced in the 19th century, many native digging mammals like bilbies and bettongs have been driven to extinction or near-extinction. This raises a natural question: can rabbits fill the soil-engineering role that those lost species once played? The evidence says no, or at least not well. Despite functional similarities in their digging behavior, invasive rabbits created fewer pits that were less favorable for seedling establishment than those of native engineers. The implication is that a suite of ecosystem processes tied to fertile patch creation has been lost with the disappearance of bilbies and bettongs, and rabbits are a poor substitute.6Biological Invasions. Can the invasive European rabbit (Oryctolagus cuniculus) assume the soil engineering role of locally-extinct natives?
Rewilding programs have started to grapple with this problem. Some reintroductions of soil-disturbing vertebrates have been intentional and used native species, as with bettong and bilby programs in Australia. In other cases, exotic animals including rabbits have accidentally or intentionally replaced processes lost through the extinction of functionally similar species.7PubMed Central. Rewilding soil-disturbing vertebrates to rehabilitate degraded landscapes: benefits and risks The tension is real: removing invasive rabbits from a landscape where native diggers are already gone may eliminate the last remaining source of soil disturbance, impoverishing the system further. But keeping them means tolerating a substandard replacement that brings its own set of problems.
Mycophagous (fungus-eating) mammals that dig also disperse important soil fungi, including mycorrhizae that help plants absorb nutrients. Their diggings create sites where fungal growth can establish.8Mammal Review. Is the loss of Australian digging mammals contributing to a deterioration in ecosystem function? Rabbits are not strong mycophagists, so this particular service is one they cannot replicate even partially. The loss of native diggers, then, affects the below-ground fungal networks that underpin plant health, a connection that is invisible at the surface but ecologically profound.
Seed Dispersal Through the Gut
When rabbits eat fruit and seeds, some of those seeds survive passage through the digestive tract and are deposited elsewhere in droppings. This form of seed dispersal, called endozoochory, can be significant for certain plant species, though rabbits are selective and inconsistent dispersers. In a study testing three shrub species, between 5% and 76% of ingested seeds were recovered from rabbit dung, with large differences between plant species and between male and female rabbits. For myrtle (Myrtus communis), gut passage actually increased germination rates. For hawthorn (Crataegus monogyna), germination dropped, and seeds of mastic (Pistacia lentiscus) did not survive at all. The rabbits were acting as seed predators for two species and as genuine dispersers for only one.9Basic and Applied Ecology. Effects of rabbit gut passage on seed retrieval and germination of three shrub species
In central Chile, where European rabbits were introduced, they dispersed seeds of the endemic shrub Lithrea caustica. Gut passage reduced seed survival, with roughly 82% surviving the first pass, but the seeds that did survive germinated faster and at higher rates than uneaten seeds. Critically, rabbit droppings were deposited in higher proportions underneath existing woody cover, which turned out to be where seedlings had the best survival odds anyway.10Journal of Arid Environments. Ecological efficiency and legitimacy in seed dispersal of an endemic shrub (Lithrea caustica) by the European rabbit (Oryctolagus cuniculus) in central Chile So even an introduced rabbit population can provide a real dispersal service for specific native plants, a situation that complicates the blanket characterization of invasive rabbits as purely destructive.
At the community level, rabbit endozoochory has measurable effects on grassland dynamics. In Mediterranean pastures, rabbit-dispersed seeds significantly increased the number of germinable seeds, and the richness and diversity of the seed bank in small disturbed patches. The species carried in rabbit dung tended to be grazing-tolerant, meaning the dispersal service reinforced the kind of plant community that thrives under rabbit grazing.11Ecography. Seed bank build‐up in small disturbances in a Mediterranean pasture: the contribution of endozoochorous dispersal by rabbits Rabbits are not passive passengers in their landscapes; they actively shape which plants colonize disturbed ground.
Grazing and Plant Community Architecture
Rabbit grazing does not simply reduce vegetation. It creates a patchwork landscape. In grazed areas, researchers found that rabbits reduced plant height and biomass but increased soil levels of ammonia and nitrate. The grazed landscape became a mosaic of heavily cropped “lawns” with nutrient-rich soils interspersed with taller “tussock” patches where soil was nutrient-poor.12PubMed. Spatial heterogeneity and plant species richness at different spatial scales under rabbit grazing This spatial heterogeneity is itself ecologically valuable. Different species thrive in each patch type, and the contrast between short and tall vegetation creates edge habitat that supports a wider range of invertebrates and ground-nesting birds than a uniform sward would.
The flipside is overgrazing. When rabbit densities get too high, the lawn patches expand at the expense of everything else, and the mosaic degrades into stripped-bare ground. On islands and in enclosed habitats where rabbits cannot be kept in check by predators or disease, this grazing pressure can eliminate sensitive plant species entirely. On some subtropical islands, rabbit presence has been linked to declining soil nitrogen, which in turn affects the growth of both native and endemic plant species. The line between beneficial herbivory and destructive overgrazing depends almost entirely on population density and whether predators exist to keep that density in check.
Snowshoe Hares and the Boreal Cycle
While the European rabbit dominates Mediterranean and temperate discussions, a close relative plays an equally dramatic ecological role in northern forests. The snowshoe hare of North America undergoes roughly ten-year population cycles that drive the dynamics of entire boreal ecosystems. Experimental research showed that excluding predators doubled hare density during the peak and decline phases, while adding supplemental food tripled it. Combining both interventions increased density eleven-fold. Critically, added nutrients boosted plant growth but did not directly increase hare numbers, meaning the cycle is not simply about food supply. The interaction between food availability and predation pressure together, across three levels of the food web, generates the boom-and-bust pattern.13PubMed. Impact of food and predation on the snowshoe hare cycle
The ecological effects of these cycles extend beyond simple predator-prey numbers. Nonconsumptive effects, meaning the behavioral changes prey animals make in response to predation risk rather than actual predation, have been found to be integral to explaining the lynx-hare population dynamics in boreal forests.14PubMed. Revisiting the classics: considering nonconsumptive effects in textbook examples of predator-prey interactions When hare populations are declining and predator pressure is high, surviving hares become more cautious, forage less, and reproduce at lower rates than food availability alone would predict. This “landscape of fear” effect deepens the population trough and slows recovery, meaning the hare’s own behavioral responses to danger become part of the ecological mechanism.
Smaller rabbit species show analogous habitat-use patterns. Pygmy rabbits in western North America, for instance, use microsites more intensely when those areas offer higher food quality and greater aerial concealment cover, and they stay closer to burrows when foraging.15PubMed Central. Food quality, security, and thermal refuge influence the use of microsites and patches by pygmy rabbits (Brachylagus idahoensis) across landscapes and seasons This selective use of space means rabbits do not graze uniformly. They concentrate their activity in safe, high-quality patches and leave riskier areas less disturbed, which itself creates heterogeneity in the plant community.
Rabbits as Hosts for Parasites and Disease Vectors
Any abundant, ground-dwelling mammal becomes a reservoir for ectoparasites, and rabbits are no exception. In southern Italy, over 75% of wild rabbits examined carried ticks, with three tick species identified. Some of those tick species are recognized vectors for pathogens of concern to humans and domestic animals, including Rickettsia species that cause spotted fever-group infections.16PubMed. Ectoparasites of wild rabbit (Oryctolagus cuniculus) in Southern Italy In an urban setting in Germany, researchers found nine parasite species on wild rabbits, including two verified human-pathogenic ectoparasites and two potentially pathogenic ones.17PubMed. Parasites of wild rabbits (Oryctolagus cuniculus) from an urban area in Germany, in relation to worldwide results
In Australia, invasive rabbits at the urban-forest boundary host large numbers of Ixodes ticks. One study collected over 2,400 ticks from just 42 rabbits, the vast majority of them larvae. The most abundant species was Ixodes holocyclus, a generalist tick responsible for significant health concerns for humans and companion animals.18PubMed. Invasive rabbits host immature Ixodes ticks at the urban-forest interface In areas where rabbits are abundant near human settlements, they essentially become a nursery for tick populations that can then attach to pets and people. Rabbit control in peri-urban areas is sometimes driven as much by tick management as by vegetation protection.
This role as parasite host feeds back into the broader ecosystem in less obvious ways. By maintaining large tick populations, rabbits influence the transmission cycles of tick-borne pathogens that affect other wildlife. A decline in rabbit numbers can reduce tick abundance, potentially lowering disease exposure for other ground-dwelling mammals and birds. But it can also concentrate remaining ticks onto fewer available hosts, temporarily increasing per-animal tick loads. The disease ecology of rabbits is not a simple story of more rabbits meaning more disease.
The Invasive Side of the Ledger
Outside their native Iberian range, European rabbits have caused some of the most dramatic ecological damage documented for any introduced mammal. The effects include habitat degradation from overgrazing, competition with native mammals, and facilitating mesopredator release and hyperpredation.19Mammal Review. A conservation paradox for the 21st century: the European wild rabbit Oryctolagus cuniculus, an invasive alien and an endangered native species Australia is the most widely cited example, but rabbits have caused similar problems on oceanic islands and in parts of South America and New Zealand.
The competition question is more nuanced than the headline version suggests. On predator-free islands in Australia, rabbit presence did not influence whether native marsupial species occupied a site. However, some smaller mammals like bandicoots shifted their peak activity periods when rabbits were around, adopting earlier and more defined activity windows in the absence of rabbits.20Austral Ecology. Interactions between European rabbits and native marsupials in the absence of terrestrial predators This suggests that the competitive effect is behavioral rather than spatial: rabbits do not necessarily push native species out of an area, but they do alter how those species use their time and space. In a system where predators are also present, those behavioral shifts could have survival consequences.
Even the direct competition narrative has exceptions. Research on burrowing bettongs found that their reproduction, recruitment, and survival did not vary with changes in rabbit density, casting doubt on the idea that competition with rabbits was an important factor in the bettong’s decline.21Wildlife Research. Do European rabbits (Oryctolagus cuniculus) influence the population ecology of the burrowing bettong (Bettongia lesueur)? Introduced predators like foxes and cats, which rabbits help sustain through hyperpredation, may have been the real drivers of native mammal loss. In that framing, rabbits harmed native species not by competing with them directly but by feeding the predators that killed them.
Rabbits Moving Into Cities
Urban and peri-urban areas are increasingly hosting rabbit populations, and these environments create their own ecological dynamics. Research in the Iberian Peninsula found that urbanization affects rabbit density, but does not uniformly create refuge areas around human settlements. Single-family residential development had a significant negative effect on rabbit abundance, while multi-family and commercial or industrial areas showed different patterns.22PubMed Central. Do Peri-Urban Areas Act as Refuges for the European Rabbit (Oryctolagus cuniculus L.)? The type of urban development matters: low-density housing with gardens and fences apparently disrupts rabbits more than denser development, possibly because of domestic dogs and cats or because the habitat fragmentation of suburban sprawl is particularly inhospitable.
Feral domestic rabbits are a related but distinct phenomenon. In European cities, abandoned or escaped pet rabbits have established breeding populations in urban green spaces with surprising speed. In one documented case, feral rabbits colonized a study area and reached high densities in under five years, becoming a food resource for native urban predators and something of a local icon for human residents.23European Journal of Wildlife Research. Feral rabbit populations in a peri-urban area: insights about invasion dynamics and potential management strategies These feral populations raise concerns that parallel the broader invasive-rabbit story, but in a setting where public sentiment often favors the rabbits, making management politically difficult.
Urban rabbit populations also bring the parasite-host dynamic discussed earlier directly into contact with people. The Australian finding of thousands of ticks on rabbits at the urban-forest interface is not an abstract ecological observation; it is a public health consideration for anyone walking their dog in a park bordering bushland. Cities that host large rabbit populations are, in effect, hosting a tick-amplification system in their greenbelts.
Leporids Worldwide
The ecological roles described so far are not unique to the European rabbit. Across their native ranges, at least 12 leporid species that have been translocated at some point are known to provide resources for other species, act as seed dispersers and ecosystem engineers, function as primary prey for multiple predator species, and perform many other ecological functions.24Mammal Review. The roles of leporid species that have been translocated: a review of their ecosystem effects as native and exotic species The pattern of rabbits and hares as foundational prey species, soil disturbers, and seed movers repeats itself across very different biomes, from Mediterranean scrubland to boreal forest to arid steppe. The specific predators, plants, and parasites differ, but the structural role remains strikingly consistent: a mid-sized herbivore that breeds prolifically, digs actively, and feeds nearly everything above it on the food chain.
The evolutionary roots of this ecological versatility may stretch back millions of years. Analysis of lagomorph evolutionary history suggests that the expansion of grasslands in the late Miocene, driven by global environmental change, promoted the diversification and range expansion of the leporid family while simultaneously contracting the ranges of their relatives, the pikas.25PubMed Central. Evolutionary history of lagomorphs in response to global environmental change In other words, rabbits and hares as a group evolved to exploit open and semi-open landscapes, and they have been shaping those landscapes in return ever since. The roles we observe today are not incidental behaviors but the product of a long co-evolutionary history between leporids, the plants they eat, the predators that eat them, and the soils they dig through.