The first crack in this armor appeared in 1822, when British politician Richard Martin passed the "Ill Treatment of Cattle Act," making it a crime to "beat, abuse, or ill-treat" horses, cows, and sheep. The press mocked it as "Martin’s Act," but the precedent was seismic: for the first time, a Western government acknowledged that inflicting unnecessary suffering on an animal was morally wrong.

Where you stand depends on your answer to a single question:

The animal rights movement emerged much later, primarily in the 1970s. Philosopher Peter Singer’s 1975 book, Animal Liberation , applied the principle of utilitarianism (maximizing pleasure, minimizing pain) to non-humans. Singer argued that the capacity to suffer—not intelligence, strength, or language—is the baseline for moral consideration. If a human infant or a comatose adult has rights, why not a pig or a chicken?

“A right is not the right to have a bigger cage.”