The term first appeared during a protest against animal experimentation in 1970. Philosophers and animal rights advocates state that speciesism plays a role in the practice of factory farming, animal slaughter, blood sports (such as bullfighting and rodeos), the taking of animals' fur and skin, and experimentation on animals, as well as the refusal to help animals suffering in the wild due to natural processes and the categorization of certain animals as invasive, then killing them based on that classification. They argue speciesism is a form of discrimination that constitutes a violation of the Golden Rule because it involves treating other beings differently to how they would want to be treated because of the species that they belong to.