The distinction is when a human being is inquisitive, "Why I am put into this miserable condition of life? Is there any remedy? Is there any perpetual, eternal life? I want I shall not die, I shall live very happily and peacefully. Whether there is a chance? What is that method? What is that science?" When these inquiries will be there and steps should be taken for answering the question, that is human civilization. Otherwise it is dog's civilization. If there is no such inquiry, then it is animal.
Animals are satisfied if they can eat something and sleep and have some sex life and some defense. That's all. There is no defense, actually, because nobody can protect himself from the hands of the cruel death. Therefore Hiraṇyakaśipu wanted to live forever, and he underwent severe austerities. The so-called scientists are also saying that, "By scientific method we shall stop death." This is also another crazy utterances. That is not possible. You may make very much advance in scientific knowledge, but there is no solution, by your so-called science, of these four problems: birth, death, old age and disease. There is no solution.
Therefore, one who is intelligent, he'll be eager how to solve these four prime problems. That is intelligence. Because nobody wants to die. "Why shall I die?" But there is no remedy. I have to die. The . . . everyone is very much anxious to stop increase of population by so many contraceptive method. But still, birth is going on. So there is no stoppage of death.