We are the real alien of this earth. There are many reason you can find out in nature that we are the real alien of this earth. We need technology but all the earth animal have no need this technology. We can not walk without weapon in nature but without any weapon animals are proved in nature.
We are man not proved in nature. Because we are the real alien. Which we do in earth nature have a bad effect on nature. We can not maintain our ecological balance like another animal in nature. We are the real alien. By our works day by day damage this earth ecological balance. Share it with others and think it with your extraordinary knowledge.