Behind every number, a someone

Who they are.

Numbers numb. Names don't. Before talking about industries and tonnes and emissions, meet the animals themselves — what science has learned about their cognition, their social lives, and the gap between the lives they could have and the ones they get.

Bos taurus

Cows

Curious, devoted mothers with lifelong friendships.

01

Cognition & emotion

Cows show measurable excitement when they solve a problem — researchers call it the 'eureka' response. They recognise dozens of individual cows and humans by face.

Social life

Form lasting friendships and grieve when separated. A mother and calf will call to each other for days after weaning.

Lifespan

Natural~20 years
Reality4–6 years (dairy) · 12–18 months (beef)

What we do instead

Dairy cows are forcibly impregnated yearly; calves are removed within hours. Male dairy calves are killed for veal or shot at birth.

Surprising fact

Cows have best friends. Heart rate drops measurably when paired with their preferred companion.

Sources

Sus scrofa domesticus

Pigs

Smarter than dogs. Cleaner than cats. Confined like neither.

02

Cognition & emotion

Pigs solve mirror tasks, use joysticks to play simple video games, and outperform 3-year-old children on some object-permanence tests.

Social life

Live in matriarchal groups, recognise dozens of individuals, and have distinct calls for food, alarm, and reunion.

Lifespan

Natural10–15 years
Reality5–6 months

What we do instead

Mother pigs are confined in gestation crates barely larger than their bodies. Piglets are castrated, tail-docked, and teeth-clipped without anaesthesia.

Surprising fact

Pigs dream in REM sleep — and seem to have nightmares after stressful days.

Sources

Gallus gallus domesticus

Chickens

Self-control, basic arithmetic, and a vocabulary of 30+ calls.

03

Cognition & emotion

Chickens can delay gratification for a bigger reward, count small quantities, and learn by observing other chickens.

Social life

Hens cluck to unhatched chicks; chicks answer from inside the egg. Roosters offer food to favoured hens with a special call.

Lifespan

Natural6–10 years
Reality35–42 days (broiler) · 72 weeks (laying)

What we do instead

Broilers grow so fast their legs collapse. Male chicks of laying breeds — ~6 billion per year — are killed on day one by maceration or gas.

Surprising fact

Chickens have full-colour vision better than ours, including a fourth cone that sees ultraviolet.

Sources

All finfish + shrimp

Fish

Pain receptors, long memories, and cooperative hunting.

04

Cognition & emotion

Fish use tools (wrasses break shells on rocks), recognise individual humans, and remember escape routes for months.

Social life

Cleaner-fish maintain stable client relationships. Many species form lifelong pair bonds.

Lifespan

NaturalVaries — many species 10–50+ years
RealityKilled at 1–2 years (farmed) or any age (wild)

What we do instead

Most are killed without stunning — left to suffocate on ice or crushed under their own weight in nets. ~38 million tonnes of bycatch per year.

Surprising fact

Studies show fish have nociceptors and opioid systems indistinguishable from mammals'. They feel pain.

Sources

Ovis aries

Sheep

Face-readers, problem-solvers, and devoted to family lines.

05

Cognition & emotion

Sheep recognise up to 50 individual faces — sheep or human — for over two years. They can solve mazes and choose familiar faces under stress.

Social life

Form matrilineal groups; grandmothers, mothers, and daughters often graze together for life.

Lifespan

Natural10–12 years
Reality6–8 months (lamb) · 4–5 years (wool)

What we do instead

Lambs are tail-docked and castrated without pain relief. Mulesing — cutting away skin from live sheep — remains common in Australian wool.

Surprising fact

Sheep have rectangular pupils that give them near-360° vision, and they recognise human emotions from photographs.

Sources

Meleagris gallopavo

Turkeys

Curious flock-keepers selectively bred until they can't reproduce.

06

Cognition & emotion

Turkeys recognise faces, learn their names, and form preferences for specific humans. Wild turkeys solve novel foraging puzzles and remember solutions for years.

Social life

Live in matriarchal flocks; mothers teach poults what to eat and which predators to fear. Make over 20 distinct vocalisations.

Lifespan

Natural~10 years
Reality14–18 weeks

What we do instead

Industrial 'broad-breasted white' turkeys have been bred so large they cannot mate naturally — every commercial turkey is the product of artificial insemination. Beaks and toes are trimmed without pain relief.

Surprising fact

Turkeys blush. The bare skin on their heads and necks changes colour with mood — pink when relaxed, deep red when excited or distressed.

Sources

Octopoda

Octopuses

Tool-using, problem-solving minds with eight independent arms.

07

Cognition & emotion

Octopuses open childproof jars, navigate mazes, and use coconut shells as portable shelters — the first documented invertebrate tool use.

Social life

Largely solitary but show distinct individual personalities; some recognise individual humans by face and behave differently toward each.

Lifespan

Natural1–5 years (most species)
RealityWild-caught at any age; first commercial octopus farms now under construction in Spain

What we do instead

Most octopuses are killed by being clubbed, sliced alive, or asphyxiated. The first industrial octopus farm, planned for the Canary Islands, would confine 1 million highly intelligent solitary animals together each year.

Surprising fact

Two-thirds of an octopus's neurons are in its arms — each arm can taste, decide, and act semi-independently of the central brain.

Sources

If we wouldn't do it to a dog, why a pig?

The line between 'pet' and 'food' is geography, habit, and marketing — not biology, intelligence, or capacity to suffer.

Take the 7-day challengeSee the industries

Key takeaways

  • Cows form lifelong social bonds and grieve separation from their calves.
  • Pigs solve puzzles at the level of a 3-year-old child and use mirrors to locate food.
  • Chickens have distinct personalities, count small numbers, and use referential calls.
  • Fish learn, remember, cooperate, and — evidence now shows — feel pain.

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Frequently asked questions

By most cognitive measures — problem-solving, self-recognition, social learning — pigs match or exceed dogs. They are also emotionally sensitive, forming preferences and lasting attachments.

Keep reading

Animals
Numbers, industries, and the system as a whole.
Why
The moral case.
Documentaries
Films that changed minds.

What the science says about who they are

Cognition, sentience and the animals in the food system

The question of what farmed animals experience is no longer speculative. There is a substantial comparative-cognition literature, and it consistently finds more than the industries that use these animals find convenient.

Sentience is now a legal as well as scientific finding

The 2012 Cambridge Declaration on Consciousness concluded that the neurological substrates of conscious experience are not unique to humans and are present in mammals, birds and other animals including octopuses. The UK's Animal Welfare (Sentience) Act 2022 extended formal recognition to decapod crustaceans and cephalopods following a systematic review of the evidence. The EU has recognised animals as sentient beings in treaty law since 1997.

Pigs

Pigs perform comparably to dogs and in some tasks to young children on tests of operant learning, spatial memory and object discrimination. They can use mirrors to locate hidden food, learn joystick-controlled video tasks, show behavioural indicators of optimism and pessimism depending on housing conditions, and display measurable empathic responses to distress in familiar conspecifics. They are typically slaughtered at around six months of a fifteen- to twenty-year natural lifespan.

Chickens

Chickens demonstrate transitive inference, self-control in delayed-reward tasks, over twenty distinct vocalisations with referential content, and rudimentary numerical discrimination in chicks days after hatching. Hens show physiological stress responses when their chicks are distressed. The stereotype of the stupid chicken is a cultural artefact of how they are kept, not a finding from any literature.

Cows, sheep and goats

Cattle show excitement and measurable heart-rate change on solving a problem — the so-called eureka response — form long-term preferential bonds, and display heightened stress at calf separation lasting days. Sheep recognise and remember dozens of individual faces, both ovine and human, for years and respond to emotional expression in photographs. Goats gaze at humans for help when a task is unsolvable, a behaviour previously thought largely restricted to domesticated companion species.

Fish and invertebrates

Fish possess nociceptors, show conditioned place avoidance after noxious stimuli, self-administer analgesics, and exhibit behavioural fever and tool use in some species. Cleaner wrasse have passed a modified mirror mark test. Octopuses show individual recognition, play, and complex problem-solving. The category 'fish' spans more evolutionary diversity than all land vertebrates combined, so generalisations should be held loosely — but the claim that they do not feel pain is no longer defensible on the current evidence.

Species at a glance

Lifespans are typical natural ranges versus commercial slaughter ages.

SpeciesNatural lifespanSlaughter ageDocumented cognitive findings
Pig15–20 years~6 monthsMirror use, joystick tasks, empathy, optimism bias
Chicken (broiler)6–8 years5–6 weeksTransitive inference, self-control, referential calls
Hen (laying)6–8 years~18 monthsMaternal stress response, numerical discrimination
Cow~20 years18–24 months (beef)Eureka response, social bonds, calf attachment
Dairy cow~20 years4–6 yearsLong-term memory, distress at separation
Sheep10–12 years6–8 monthsFacial recognition of 50+ individuals for years
Salmon (farmed)4–8 years~2 yearsNociception, avoidance learning, stress physiology
Octopus1–2 yearsVariesTool use, play, individual recognition

Comparative cognition literature · Cambridge Declaration on Consciousness (2012) · LSE sentience review (2021)

Assessing sentience claims critically

This field attracts both overstatement and dismissal. A few habits keep you on solid ground.

  1. 1

    Separate nociception from suffering

    Detecting damage and experiencing it are different claims requiring different evidence. Good papers say which they are testing.

  2. 2

    Prefer converging evidence

    Behavioural, physiological, pharmacological and neuroanatomical lines pointing the same way are far stronger than any one alone.

  3. 3

    Watch for anthropomorphic framing

    A headline about a 'pig playing video games' describes a real operant task; the paper is more careful than the coverage.

  4. 4

    Note the replication status

    Some celebrated findings, in this field as in psychology generally, have not replicated cleanly.

  5. 5

    Check who is defining the terms

    Industry-funded welfare science frequently defines welfare as absence of disease and productivity, which excludes most of what the question is about.

Well-established and contested claims

Well established

  • Mammals and birds possess the neurological substrates associated with conscious experience.
  • Fish have nociceptors and show learned avoidance of noxious stimuli.
  • Pigs, cattle, sheep and chickens form individual social recognitions and preferences.
  • Environmental enrichment measurably changes judgement-bias test outcomes.

Contested or overstated

  • Precise IQ-style comparisons between species and human age groups.
  • Claims that insects certainly do or certainly do not suffer — the evidence is genuinely unsettled.
  • Single viral studies presented as consensus before replication.
  • Assuming behavioural similarity to humans is required for moral relevance.

Questions about animal minds

Do fish feel pain?

The weight of evidence says yes in the functional sense that matters: they have nociceptors, show sustained behavioural changes after noxious stimuli, and reduce those changes when given analgesics. A minority of researchers dispute the subjective element, which is by nature harder to establish.

Are pigs really as smart as dogs?

On several standard tasks — spatial memory, operant learning, mirror-guided search — pigs perform comparably or better. Cross-species intelligence comparison is inherently rough, but the general claim is supported.

Does intelligence determine moral relevance?

Most philosophers argue it does not; the capacity to suffer does. Cognitive research matters mainly because it establishes the presence of experience, not because it ranks who deserves consideration.

What about insects and shellfish?

The UK extended legal sentience recognition to decapods and cephalopods in 2022 after a systematic review. For insects the evidence is early and genuinely uncertain, and reasonable researchers disagree.

Isn't this just anthropomorphism?

The risk exists, which is why the field relies on controlled behavioural tasks, physiological measures and pharmacological manipulation rather than observation and intuition. Assuming absence of experience without evidence is an equally strong assumption in the other direction.

Where can I read the primary research?

The Cambridge Declaration on Consciousness (2012), the LSE review of sentience in decapods and cephalopods (2021), and journals such as Animal Cognition and Applied Animal Behaviour Science are the standard entry points.

Sources

  • Low, P. et al. (2012). The Cambridge Declaration on Consciousness.
  • Birch, J. et al. (2021). Review of the Evidence of Sentience in Cephalopod Molluscs and Decapod Crustaceans. LSE.
  • Marino, L. & Colvin, C. (2015). Thinking Pigs: Cognition, Emotion and Personality in Sus domesticus.
  • Sneddon, L. (2015). Pain in aquatic animals. Journal of Experimental Biology.