What are the different types of extraterrestrials (ETs) or alleged alien species? (Alien Archetypes)
The observable universe contains at least hundreds of billions of galaxies, and some estimates put the total considerably higher. Astronomers have also discovered that planets are common throughout the cosmos. That enormous scale naturally raises one of humanity's oldest questions: Are we alone in the universe?
In modern UFO lore, the four most widely recognized alleged extraterrestrial types are the Greys, Reptilians, Nordics, and Insectoids or Mantids. Beyond these four major archetypes, UFO reports, alleged encounters, mythology, spiritual traditions, conspiracy theories, and science fiction have produced many other descriptions of supposed alien beings.
There is currently no scientifically confirmed extraterrestrial species, and no accepted scientific evidence establishes that any of these beings have visited Earth. The categories discussed here are best understood as alien archetypes found in UFO culture, folklore, spiritual belief, popular culture, and reported experiences.