Sheliak

The Sheliak area non-humanoid R3-type lifeform whose homeworld was located in the Shelia star system. Unlike most humanoids, the Sheliak preferred to exist in an environment that was the same temperature as their bodies. The Sheliak are also a xenophobic people, and avoided contact with the Federation whenever possible. This may have been due to the Sheliak attitude that humanoids are an inferior form of life (often pejoratively describing them as creatures).