It is immoral to kill animals  As evolved human beings it is our moral duty to inflict as little pain as possible for our survival. So if we do not need to inflict pain to animals in order to survive, we should not do it. Farm animals such as chickens, pigs, sheep, and cows are sentient living beings like us - they are our evolutionary cousins and like us they can feel pleasure and pain. The 18th century utilitarian philosopher Jeremy Bentham even believed that animal suffering was just as serious as human suffering and likened the idea of human superiority to racism. It is wrong to farm and kill these animals for food when we do not need to do so. The methods of farming and slaughter of these animals are often barbaric and cruel - even on supposedly 'free range' farms. [1] Ten billion animals were slaughtered for human consumption each year, stated PETA. And unlike the farms long time ago, where animals roamed freely, today, most animals are factory farmed: crammed into cages where they can barely move and fed a diet adulterated with pesticides and antibiotics. These animals spend their entire lives in their “prisoner cells” so small that they can't even turn around. Many suffer serious health problems and even death because they are selectively bred to grow or produce milk or eggs at a far greater rate than their bodies are capable of coping with. At the slaughterhouse, there were millions of others who are killed every year for food.  Further on Tom Regan explains that all duties regarding animals are indirect duties to one another from a philosophical point of view. He illustrates it with an analogy regarding children: “Children, for example, are unable to sign contracts and lack rights. But they are protected by the moral contract nonetheless because of the sentimental interests of others. So we have, then, duties involving these children, duties regarding them, but no duties to them. Our duties in their case are indirect duties to other human beings, usually their parents.” [2] With this he supports the theory that animals must be protected from suffering, as it is moral to protect any living being from suffering, not because we have a moral contract with them, but mainly due to respect of life and recognition of suffering itself.  [1] Claire Suddath, A brief history of Veganism, Time, 30 October 2008  [2] Tom Regan, The case for animal rights, 1989