1637
Machines that feel nothing?
biologyhistory
The French philosopher René Descartes argued that animals work like clockwork machines: they move and cry out, but have no mind that feels. Some scientists of his time used the idea to excuse experiments on living animals. Others disagreed at once, and today biology shows that mammals, birds and many other animals have nerves, pain pathways and stress hormones much like ours.
Ask: if an animal acts hurt, what evidence would show it feels hurt?
Photo: After Frans Hals, Public domain via Wikimedia Commons
1789
Can they suffer?
history
Jeremy Bentham, an English thinker, said the right action is the one that brings the most happiness and the least suffering. In a famous footnote he wrote that the question about animals is not whether they can reason or talk, but whether they can suffer. If they can, he argued, their suffering counts.
Bentham's footnote is still quoted by both welfare and rights groups. Do they read it the same way?
Photo: Henry William Pickersgill, Public domain via Wikimedia Commons
1965 and 1979
The Brambell Report and the Five Freedoms
biologyhistoryeconomics
After Ruth Harrison's 1964 book Animal Machines described crowded indoor farms, the British government asked a committee led by Professor Roger Brambell to study farm animals. Its 1965 report said an animal should at least be able to turn around, groom itself, get up, lie down and stretch its limbs. In 1979 the Farm Animal Welfare Council turned this into the Five Freedoms: freedom from hunger and thirst; from discomfort; from pain, injury and disease; to express normal behavior; and from fear and distress.
The Five Freedoms are still written into farm, zoo and shelter standards around the world.
Photo: Žiga, CC BY-SA 3.0 via Wikimedia Commons
1994 to 2020
From freedoms to domains
biology
Scientists David Mellor and Cam Reid proposed the Five Domains model in 1994: nutrition, physical environment, health, behavioral interactions and mental state. The first four shape the fifth, how the animal feels. Newer versions ask not only whether an animal is spared pain, but whether it has good experiences too: play, comfort, choice and calm.
A shift from 'no suffering' to 'a life worth living'. How would you measure a good day for a hen?
Photo: KaiBorgeest, CC BY-SA 4.0 via Wikimedia Commons
1975
Animal Liberation
historyeconomics
The Australian philosopher Peter Singer argued that equal suffering deserves equal concern, whatever the species. He borrowed the word speciesism (coined by Richard Ryder in 1970) for favoring our own species just because it is ours. His book attacked factory farming and many animal experiments. Singer does not argue that animals have rights; he weighs harms and benefits.
Critics say his weighing can put some animal interests close to human ones. Supporters say that is the point.
Photo: kallerna, CC BY-SA 4.0 via Wikimedia Commons
1983
The case for animal rights
history
The American philosopher Tom Regan argued that many animals are 'subjects of a life': they have memories, wants and a welfare of their own. Such beings have rights that cannot be traded away even for good results, so he called for ending animal farming and animal experiments, not just improving them. This is the rights view; it asks whether we may use animals at all.
Critics ask where the line falls: mammals, birds, fish, insects? Regan's answer and Singer's differ.
Photo: Reinhold Möller Ermell, CC BY-SA 4.0 via Wikimedia Commons
Today
The welfare view
biologyeconomics
Most veterinarians, farm scientists and laws take the welfare view: people may use animals for food, work, research and companionship, but must do it humanely and avoid needless suffering. The American Veterinary Medical Association's welfare principles ask for good care, good handling and a humane death. The animal scientist Temple Grandin designed curved cattle chutes and audits that many meat plants now use.
Rights advocates call this 'bigger cages'. Welfare advocates answer that real animals are helped today, not someday.
Photo: Uberprutser, CC BY-SA 3.0 via Wikimedia Commons
As old as farming
The farmer's view: stewardship
economicshistory
Many farmers and ranchers see good care as a duty and as good business: a calm, healthy animal grows, gives milk and lays eggs. Farm groups such as the American Farm Bureau Federation support animal-care training and audits, but warn that rules written far from the barn can misread farm life, raise food prices and push small farms out.
Visit a farm, a sanctuary and a shelter if you can. What does each one count as good care?
Photo: H. Zell, CC BY-SA 3.0 via Wikimedia Commons