They are the least likely of alien species to exist, which is unfortunate, because they are the friendliest. They are the mix-breed of Humans and Greys that the Greys are creating. Why they have their own civilization would be a mystery if being a clone is true. The creatures have our advanced senses, while they have the Greys advanced brain. There are many different beliefs people have today.
Some people flatly disbelieve that there are planets orbiting the stars that are in the Milky Way.
This is false, as there has been a recent discovery of at least three planets orbiting a nearby star. Also, the Hubble telescope has seen, what is thought to be the birth of a starsystem. The star is surrounded by a large disk of black substance, which proves the theory of how solar systems are formed. But, some people think there is only one civilization in a galaxy. More believable would be that there are other civilizations out in space, only they are flying around, ignoring us, as they have no use for a civilization that is as far ahead of us as we are compared to ants.