European polecats are dedicated carnivores whose diet revolves around small mammals, especially rodents. Across the majority of studied populations, rodents rank as the single most consumed prey group, showing up as the principal food source in over half of all sites examined across Europe. But the polecat is also an accomplished generalist. Depending on where it lives and the time of year, its menu can swing heavily toward frogs, rabbits, birds, or even insects, making its feeding habits more flexible and regionally varied than its reputation as a simple “rat-catcher” suggests.
Rodents Form the Dietary Backbone
A comprehensive review of polecat diet studies across 18 European sites found that rodents were the principal prey at more than half of them and ranked as secondary prey at most of the rest.1Mammal Review. Trophic status and feeding habits of the European Polecat Mustela putorius L. 1758 Voles, rats, and mice are the usual targets. In Hungary, stomach content analysis showed small mammals made up between roughly half and three-quarters of the diet across all seasons, with common voles and hamsters as the most frequent prey items.2Mammalian Biology. Diet of the European polecat and the steppe polecat in Hungary A French study at low polecat density found small mammals represented about 69% of all prey items recovered from scats.3BioOne (Wildlife Biology). Habitat use by the European polecat Mustela putorius at low density in a fragmented landscape
The pattern holds in Polish agricultural landscapes too, where mammals accounted for about 43% of prey occurrences in scats, with rodents dominating that group and making up roughly half the overall diet.4Folia Zoologica. Diet of the European polecat Mustela putorius in an agricultural area in Poland What emerges from all of this is a remarkably consistent picture: wherever polecats live alongside healthy populations of voles and other small rodents, those rodents become the dietary staple. The specific species differ from one region to the next, but the dependence on small burrowing mammals stays constant.
When Rabbits Take Over the Menu
The rodent-dominated pattern breaks down in parts of southern Europe, particularly on the Iberian Peninsula, where wild rabbits are abundant. A study in a Mediterranean-climate area of Portugal found that lagomorphs were the most consumed prey, contributing roughly 87% of the estimated prey biomass in polecat scats. The researchers noted a strong spatial overlap between scats rich in rabbit remains and areas where rabbit availability was highest.5Mammalian Biology. Is polecat (Mustela putorius) diet affected by “mediterraneity”? That finding led them to describe polecats in those regions as wild-rabbit specialists, meaning the polecat’s foraging activity tracked rabbit abundance closely across the landscape.
This has conservation implications. Wild rabbit populations in Iberia have declined dramatically over the past several decades due to disease, and any predator that leans this heavily on rabbits is vulnerable to those same declines. For polecats in rabbit-rich habitats, a crash in rabbit numbers can mean a real food crisis, forcing them to switch to alternative prey or move elsewhere.
Frogs and Toads as a Major Seasonal Resource
One of the more surprising aspects of polecat diet is how important amphibians can be. In some wetland and riparian habitats, frogs and toads are not a side dish but the main course. A study in Scotland found that amphibians, primarily common frogs, made up about 94% of polecat prey biomass at the sites examined.6Journal of Zoology. Low individual diet variation and high trophic niche overlap between the native polecat and invasive American mink That is an extraordinary degree of dietary specialization for an animal generally considered a generalist predator.
Polecats are especially effective at exploiting frogs during the breeding season. When frogs congregate at spawning sites in spring, polecats home in on these gatherings and adjust their movement patterns to stay near them. Research on this behavior found that polecats made their shortest movements during the spring breeding period and shifted between bursts of small-scale searching and longer directed travel toward profitable frog-spawning locations.7Austral Ecology. Functional response and area‐restricted search in a predator: seasonal exploitation of anurans by the European polecat, Mustela putorius Essentially, the polecats knew where the frogs were gathering and focused their effort there, a hunting strategy that ecologists call area-restricted search.
The French habitat-use study mentioned earlier captured this seasonal swing clearly: amphibians accounted for about 25% of prey items overall but rose to 37% during summer, while small mammals dropped from 82% in winter to a smaller share during warmer months.3BioOne (Wildlife Biology). Habitat use by the European polecat Mustela putorius at low density in a fragmented landscape So frogs and toads fill a predictable niche in the annual diet cycle, peaking when they are easiest to catch and declining when they become scarce or dormant.
How the Diet Shifts Through the Year
Seasonal variation is one of the defining features of polecat feeding ecology, and it goes beyond just the amphibian peak. In Great Britain, where polecat populations have recovered substantially over recent decades, researchers documented that lagomorph occurrence in the diet was highest during spring and summer and lowest in autumn.8Mammal Research. Diets of European polecat Mustela putorius in Great Britain during fifty years of population recovery This timing aligns with the rabbit breeding season, when young rabbits are abundant and vulnerable.
Winter, by contrast, tends to push the diet toward rodents almost exclusively. With amphibians dormant underground or underwater, and young rabbits no longer available, polecats fall back on the prey that remains active year-round: voles, rats, and mice sheltering in barns, hedgerows, and fields. The French study’s finding that small mammals represented 82% of winter prey items illustrates just how rodent-dependent polecats become during the cold months.3BioOne (Wildlife Biology). Habitat use by the European polecat Mustela putorius at low density in a fragmented landscape
The general rhythm looks something like this: rodents dominate in autumn and winter, amphibians surge in spring as breeding congregations form, and lagomorphs become more important through spring and into summer where rabbits are present. Birds, reptiles, fish, and invertebrates fill in around the edges in all seasons. It is a diet driven almost entirely by what is locally available and easy to catch at any given moment.
The Supporting Cast of Prey
Beyond the big three categories of rodents, lagomorphs, and amphibians, polecats eat a wide range of other animals. The Polish agricultural-area study documented birds as the secondary prey group after mammals, with medium-sized species being most common. Reptiles, fish, and anurans collectively complemented the diet, and invertebrates turned up frequently in scats but contributed only a small percentage of total biomass.4Folia Zoologica. Diet of the European polecat Mustela putorius in an agricultural area in Poland Fruit and plant material were rarely consumed, reinforcing that polecats are overwhelmingly meat-eaters who only incidentally ingest vegetation.
The Hungarian comparison study found that European polecats have a more diverse diet than their close relative the steppe polecat, incorporating a higher proportion of beetles, amphibians, eggs, and birds.2Mammalian Biology. Diet of the European polecat and the steppe polecat in Hungary That distinction matters because the steppe polecat occupies drier, more open habitats where amphibian prey is scarce. The European polecat’s association with wetter, more varied landscapes gives it access to a broader buffet. Beetles and other insects show up regularly in scat analysis, though their tiny body mass means they add little to the polecat’s caloric intake. They may be consumed incidentally while the polecat roots around in leaf litter and soil, or they may be deliberately eaten as opportunistic snacks.
Fish appear in the diet too, usually in small quantities. Polecats are capable swimmers and will take fish from shallow streams, ponds, and ditches, but this does not seem to be a foraging strategy they rely on heavily in most places. Eggs, especially from ground-nesting birds, round out the opportunistic side of the diet. A polecat that stumbles across a nest will readily eat the contents.
Polecats, Poultry, and Game Birds
The polecat has a long and somewhat fraught relationship with people who keep poultry or rear game birds. Its habit of raiding chicken coops and pheasant pens was a major factor in the persecution that drove British polecat populations to the brink by the early twentieth century. But how significant a problem is the polecat for farmers and gamekeepers today?
A survey of British farmers found that only 11% had ever experienced damage by polecats, and 28% considered the species a threat to livestock.9Mammal Review. An assessment of British farmers’ and gamekeepers’ experiences, attitudes and practices in relation to the European Polecat Mustela putorius Among gamekeepers, the picture was somewhat different: two-thirds had experienced polecat predation on penned game, with the animals typically getting in through pop-holes or by squeezing under perimeter wire. Still, most gamekeepers rated the polecat as only a minor pest and ranked it below foxes, feral cats, stoats, corvids, and mink as a threat to game birds.9Mammal Review. An assessment of British farmers’ and gamekeepers’ experiences, attitudes and practices in relation to the European Polecat Mustela putorius
The polecat’s reputation as a hen-house raider is not undeserved, but it is historically exaggerated. Polecats are drawn to enclosed poultry because it is easy prey in a confined space, not because domestic birds are a preferred food. In wild settings, the polecat overwhelmingly targets rodents and amphibians. The conflict is really about access: a polecat that finds an unsecured coop will exploit it, but one that cannot get in will simply move on to natural prey. Sturdy wire mesh and sealed entry points solve most of the problem.
The Rodenticide Problem
Because polecats eat so many rodents, they are directly exposed to the poisons used to control those rodents. Second-generation anticoagulant rodenticides, the chemicals found in many commercial rat and mouse baits, do not kill rodents immediately. A poisoned rat or mouse may survive for several days, during which time it can be caught and eaten by a polecat, passing the toxin up the food chain.
Early monitoring from Britain in the 1990s found that about 35% of male and 39% of female polecats tested had detectable levels of at least one anticoagulant rodenticide in their livers.10Environmental Pollution. Spatial and temporal analysis of second-generation anticoagulant rodenticide residues in polecats (Mustela putorius) from throughout their range in Britain, 1992–1999 By the mid-2010s, that figure had climbed sharply. A follow-up study testing polecats collected between 2012 and 2016 found detectable residues in 79% of animals tested, with bromadiolone being the most frequently detected compound at 71%, followed by difenacoum and brodifacoum.11PubMed. Long-term increase in secondary exposure to anticoagulant rodenticides in European polecats Mustela putorius in Great Britain That represents roughly a 1.7-fold increase in detection rates over 25 years.
The same study found that the probability of detecting rodenticide residues increased in polecats feeding at a higher trophic level, as inferred from nitrogen isotope analysis of their tissues.11PubMed. Long-term increase in secondary exposure to anticoagulant rodenticides in European polecats Mustela putorius in Great Britain In practical terms, this means polecats that eat more rats, rather than frogs or invertebrates, accumulate more poison. Across Europe, the widespread use of rodenticides in agriculture ensures that non-target predators like polecats face chronic secondary exposure.12Science of The Total Environment. Exposure of stone marten (Martes foina) and polecat (Mustela putorius) to anticoagulant rodenticides: Effects of regulatory restrictions of rodenticide use Whether this exposure causes direct mortality in polecats is harder to pin down, as sublethal poisoning can weaken an animal without killing it outright, making it more vulnerable to starvation, disease, or road traffic.
The irony is hard to miss. Polecats are natural rodent controllers, and the chemical rodent-control methods humans deploy are slowly contaminating one of the most effective rodent predators in the European countryside. Regulatory restrictions on rodenticide use have been introduced in several countries partly in response to this kind of non-target wildlife exposure, but detection rates in polecats have continued to climb through recent monitoring periods.
Competition with American Mink
In parts of Britain and mainland Europe, polecats now share their habitat with invasive American mink that escaped or were released from fur farms. The two species are similar in size and ecology, and their diets overlap considerably. In Scottish riparian habitats, the diet of both polecats and mink was dominated by amphibians, with common frogs making up about 94% of polecat prey biomass and roughly 90% for mink at the same sites.6Journal of Zoology. Low individual diet variation and high trophic niche overlap between the native polecat and invasive American mink That degree of overlap raises questions about competitive exclusion: can the two species coexist long-term, or will one eventually displace the other from the best foraging areas?
Mink tend to be more aquatic and oriented toward fish and crayfish in many habitats, while polecats lean more toward terrestrial rodents and burrow-dwelling prey. But where both species depend heavily on the same frog populations, the overlap is intense. As polecat populations expand back into parts of Britain they previously disappeared from, this competition is likely to become a more pressing conservation concern, particularly in wetland corridors where both species concentrate.
How Body Size Shapes What Gets Eaten
Polecats are sexually dimorphic: males are noticeably larger and heavier than females. This size difference can influence prey selection, with larger males potentially able to tackle bigger prey items. The Hungarian stomach-content data noted that most prey consumed were smaller than 50 grams and terrestrial, and the trophic niche breadth was extremely narrow.2Mammalian Biology. Diet of the European polecat and the steppe polecat in Hungary That narrow niche breadth means polecats are not distributing their effort across many prey types equally; they are concentrating heavily on a small number of prey species, typically voles, and eating other things only when those preferred items are scarce.
Research on sex-related dietary differences has been conducted, but the available evidence suggests that both sexes eat broadly the same prey types. The difference is more likely in the size range of individual prey items than in the species consumed. A male polecat might take a larger rat that a female would pass over, but both are hunting in the same habitats and targeting the same prey communities. Polecats are built for pursuing prey into tight spaces: their long, slender bodies allow them to follow rodents into burrows, and their strong jaws and neck muscles let them dispatch prey quickly underground. This anatomy is what makes them such effective rodent specialists, regardless of sex.
What Polecat Diets Tell Us About Landscape Health
Because polecats are generalists that track local prey availability closely, studying what they eat in a given area reveals something about the health of that ecosystem. A polecat population living almost entirely on frogs indicates an area with productive wetlands and healthy amphibian populations. One that depends on rodents suggests good grassland or farmland habitat. A population eating mostly rabbits points to Mediterranean-type scrubland with intact rabbit populations.
When polecat diets shift in unexpected ways, that can signal environmental change. A population that historically ate frogs but switches to rodents might be responding to wetland drainage or amphibian disease. Conversely, growing rodenticide contamination levels in polecats flag intensification of chemical pest control in the surrounding landscape. In this sense, the polecat functions as a dietary indicator species: its stomach contents reflect the broader availability and contamination status of prey across the habitats it occupies. Researchers studying polecat diet are not just learning about one animal. They are reading a record of what the local food web looks like from the perspective of a mid-sized predator that eats almost anything it can catch.