British psychologist Richard Ryder answered that question in 1970 when he coined the term “speciesism,” which was later popularized by Princeton University philosopher Dr. Peter Singer in his 1975 book Animal Liberation.25 Singer wrote that just as “racists violate the principle of equality by giving greater weight to the interests of members of their own race, speciesists allow the interests of their own species to override the greater interests of members of other species.”
