This document discusses the ideas of utilitarian philosopher Peter Singer regarding speciesism and the equal consideration of interests between humans and nonhuman animals. Singer believes that similar to racism and sexism, speciesism is morally wrong as it involves an unjustified bias in favor of one's own species. All beings that can experience pain and suffering, regardless of species, deserve equal consideration. Therefore, causing harm to animals for the sake of human interests like food or entertainment when it is not necessary cannot be justified if the harm to animals outweighs the benefit to humans.