Don't think that the animals or living entities other than the human being, they have no soul. No. That's a wrong conception. They have got souls. How you can say there is no soul. The same symptoms of life there.
Just like the symptoms of life means it takes birth at a certain date, then it grows, it stays, it gives some byproducts, then dwindles, then vanishes. Take any. Either you take tree or you take a human body, or you take an animal body or if you take an insect body, or take the demigod's body—any body you take, there is a certain date of birth, everyone, certain date of birth. And then there is a certain duration of life. Somebody lives for ten years. Somebody lives for one year. Somebody lives for six hours, five hours. There are many germs. They live for five hours, six hours, or even less than that. And there are living entities like Brahmā, whose life is millions and millions of years.