Have you ever thought that human are actual aliens. We always look for aliens which look like us but are evil. However, no matter how hard we tried, we never found any aliens and felt sad! On the other hand, someone focuses their attention on us. They think that human is a very special kind of creature in the world. We like eating meat but without sharp teeth like lions. So, we learn to cook meat with fire or other tools. We can't run fast, then we invented cars, trains and planes. Throughout much of human history, all the things that humans created were really strange and great in other creatures' eyes. Lions can be the king of the animal world, but they are just a prey for people who like hunting. We are often asked to protect the environment, because only human can destroy nature. So, are human beings really a part of nature? All the plants and animals live in harmony as soon as there is no people around.