I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth. ~ Stephen Hawking

A survey of the major alien species who have visited Earth
A quick overview of the major alien species that have been reported, what have we missed, let us know in the comments.
Greys

The grey alien species is by far the most commonly reported species of aliens, coming to the forefront of most people’s attention from the abduction story revealed by Betty and Barney Hill. Later stories would also add to this as it has been reported that the the aliens recovered from the Roswell wreckage were also grey aliens.
The grey aliens have become to be associated with the star system Zeta Reticuli due to the interpretation of a map that was revealed by Betty and Barney Hill while under hypnosis.
Hopkinsville Goblins

In 1955, the Sutton family of Hopkinsville, KY suddenly showed up in the sheriff’s station claiming they’d been under attack for four hours. The story that they would go on to tell involved a silver space ship, and tiny flying creatures that they battled for hours. They fully believed they shot several of the aliens but no bodies were found when police arrived. The creatures were misreported in the newspaper as green instead of silver and this is where the phrase little green men comes from.
Nordic Aliens

The nordic aliens are reportedly a race of humanoid alien species who come from the Pleiades and are reported to be six to seven feet tall, with fair skin, and blonde hair. The nordics are often reported to be incredibly beautiful with many reports of psychic ability. While there are some historical reports of Aryan looking aliens, the nordics are first consistently mentioned starting in the 1950s.
Reptilians

The first mentions of the ideas of reptilian aliens was in the early 20th century, both the authors Robert E Howard and Maurice Doreal used them in science fiction stories that they wrote. In the late 1960’s Herbert Schirmer, a deputy sheriff in Nebraska had a UFO encounter. Later, under hypnosis, he was able to recover memories of his experience which included the first recorded encounter with a reptilian alien.
David Icke, writing in the 1990s, was the first to widely distribute ideas about significant intrusions into human societies. He has connected the reptilians back to many past leaders and has hypothesized that they have even infiltrated powerful families like the American Bush family.
Current beliefs – the reptilian alien theory has gain much ground in recent years, it has been reported that 12 million Americans now have some belief in the reptilian theories.

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