Alien Types

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 Entities that may be considered cryptids by cryptozoologists include Bigfoot, the chupacabra, or Mokele-mbembe. Related pseudosciences include Young Earth creationism, ghost hunting, and ufology. Some dictionaries and encyclopedias define the term "cryptid" as an animal whose existence is unsubstantiated 

According to Simon Parkes a lifelong experiencer:  A Shadow Being (also known as a Shadow Figure, Shadow Person or Black Mass) is the perception of a patch of shadow as a living, humanoid figure who, like the Jinn, may be either evil, helpful or neutral and may be an extra-dimensional inhabitant of another universe 

 In popular culture and UFO conspiracy theories, men in black (MIB) are supposed men dressed in black suits who claim to be quasi-government agents who harass or threaten UFO witnesses to keep them quiet about what they have seen. It is sometimes implied that they may be aliens themselves.