Yes. Plant agriculture can kill or injure animals, but no reliable global total exists. Harm can occur when land is cleared, when crops are protected from pests, and during tillage, ploughing and harvest. The number changes radically with the species counted, the crop and region, the farming method, and whether indirect effects such as habitat loss are included.
Where plant production harms animals
Field machinery is only one part of the picture. A 2021 review, Animal Harms and Food Production: Informing Ethical Choices, identifies several pathways.
Land conversion and habitat loss
Clearing vegetation for cropland can kill resident animals and remove food, shelter and breeding sites. Displacement is also a harm, although it is not the same measurement as a confirmed death. The result depends on what land was converted, when clearing occurred and which species lived there.
Crop protection and rodent control
Farmers may poison, trap or otherwise kill animals that eat or damage crops. Pesticides can also affect non-target organisms. These impacts are not captured by a simple count of animals found dead in a field.
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Tillage, ploughing and other field operations
Soil disturbance can kill or injure small mammals and other animals living in or on the ground. Repeated passes, timing and equipment matter, so an observation from one crop cannot automatically be applied to another.
Harvesting
Combines and other harvesting equipment can kill animals sheltering in vegetation. Harvest-related mortality is real, but it is only one component of plant-agriculture harm and does not provide a universal “animals per hectare” rate.
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Why there is no dependable worldwide number
Fischer and Lamey’s 2018 analysis explains why a plausible general estimate is difficult. Studies differ in what they observe and count, and the available evidence covers only a small set of crops, places and species.
- Different boundaries: One estimate may count direct machinery deaths, while another includes poisoning, habitat conversion or longer-term indirect effects.
- Different animals and outcomes: Mice, rats, insects, birds and soil organisms are not consistently surveyed, and injury, displacement and death are different endpoints.
- Different farming conditions: Crop type, climate, field size, machinery, pest pressure and the timing of operations can change mortality.
- Counterfactual uncertainty: A comparison may need to ask what would have happened to the animals if that field had not been farmed, not merely count carcasses after harvest.
As the 2018 paper puts it, the authors “try to show just how difficult it’s to come up with a plausible estimate of how many animals are killed by plant agriculture.” That is a warning about the evidence, not proof that no animals are killed.
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What the often-quoted estimates actually mean
The “15 animals per hectare per year” figure
The figure commonly attributed to Steven Davis is an extrapolation discussed by Fischer and Lamey (2018), not a measured average for all plant foods. It combines mortality rates from two limited studies—one involving mice around grain harvest and another involving rats during sugarcane harvest—then applies assumptions to produce a per-hectare estimate. Those studies do not establish that every crop, region or production system kills 15 field animals per hectare each year.
The Australian mouse-plague estimate
The 2021 review cites a conservative estimate of at least 100 mice per hectare per year for grain production during mouse plagues in Australian croplands. The outbreak and country are essential qualifications: this is not an ordinary-grain-production rate or a worldwide average.
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These figures illustrate how context changes results. They should not be averaged together or presented as a single settled death rate.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why pesticide tonnage cannot be converted into deaths
The Food and Agriculture Organization’s 2026 release reports 3.92 million tonnes of pesticide active ingredients used globally in 2024. That is a mass of chemicals, not a count of animals killed. Products differ in toxicity, dose, persistence and application, and exposure varies among species. FAO notes potential effects on non-target plants and animals, but does not turn the tonnage into a wildlife-death estimate.
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A 2024 review likewise says that impacts of currently used pesticides on terrestrial-vertebrate biodiversity have rarely been reviewed comprehensively; evidence is stronger for some legacy products that are now banned. The state of the review literature therefore does not justify a global death total.
Can plant and meat production be compared?
Counting deaths alone cannot settle which food system causes more overall harm. The 2021 review states that “all current forms of food production harm animals in certain ways,” but that framing is not a quantified ranking. A fair comparison must make its accounting choices explicit.
| Question | What a comparison must specify |
|---|---|
| Functional unit | Per hectare, per kilogram of food, per calorie or nutrient, or per consumer over a defined period. |
| System boundary | Whether it includes production only, feed crops, land conversion, crop protection and indirect effects. |
| Geography and practice | The country or region, crop, livestock system and farming methods. |
| Animals and outcomes | Which species are included, and whether the measure is death, injury, displacement or another welfare impact. |
| Severity and counterfactual | How different harms are weighted and what would have happened without that production. |
Without those details, a raw “animals killed” total can compare unlike things and create a false sense of precision. Illustrative comparisons in the 2021 review do not weight the type or severity of harm, so they cannot by themselves prove which system causes more total suffering.
What a careful answer should say
- Animals are harmed and sometimes killed in plant production through land conversion, crop protection, tillage and harvest.
- No defensible, general death rate for plant agriculture has been established.
- The 15-per-hectare figure is a limited extrapolation, not a universal average.
- The at-least-100-mice figure applies to Australian grain fields during mouse plagues, not routine farming everywhere.
- Global pesticide-use tonnage measures chemicals, not animal deaths.
For readers deciding what to eat or how to farm, the honest conclusion is not that plant foods are impact-free, nor that one memorable number resolves the ethics. It is that animal harms occur across food systems and must be compared with clearly stated boundaries, evidence and uncertainty.
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