A species known as one of the great contrasts of the galaxy; the thoughts of the Medusans are considered to be the most sublime and beautiful in the entire galaxy, but their physical appearance is so ugly that simply looking at a Medusan is extremely dangerous. Human beings are driven insane by even the smallest glimpse of one, and will often become raving maniacs as a result. In some cases, death by widespread organ failure has been known to follow. The mental discipline possessed by Vulcans allows them to look at a Medusan safely, if it is done through a specially constructed visor. In very rare cases, non-Vulcans trained in Vulcan methods have been able to do the same. 
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Medusans are telepathic, and although establishing a telepathic link with another species is very difficult for them, this is their only method of communication. They are unable to vocalise or communicate by other methods, even with a universal translator. Medusans are also known for their extraordinary ability as navigators. 
The image shown depicts a Medusan travelling box. For safety reasons we cannot show you an actual Medusan.