Betazoids hail from the Federation member planet Betazed. A peaceful race that have developed highly telepathic abilities, the Betazoid people appreciate fine arts, literature, and philosophy. As all Betazoids are telepathic, they usually do not need to vocalize their thoughts to one another in order to communicate, but can do so for the benefit of offworlders. It is a natural ability, and likewise the strength of the skill varies from one to another. Most develop the ability in adolescence, but a few have congenitally active telepathic abilities that may cause severe mental problems due to their inability to screen out other peoples minds. Screening is a skill that is absolutely necessary for the well-being of a Betazoid,particularly for those with keen telepathic sensory skills. Externally, Betazoids are among the most humanoid species on record, and are indistinguishable from humans in every aspect but one, they have very black eyes and show no iris color. They can reproduce with humans, although this often dilutes the telepathic abilities of the offspring, case in point: Commander Deanna Troi. The children of such a union often develop empathic rather than full telepathic abilities, though they can still communicate telepathically with their Betazoid parent and a bonded mate. Full Betazoids are unable to read the minds of Ferengi, Breen, Ullians or Dopterians due to their unusual brain lobe formations, but some half Betazoids have been occasionally successful in sensing the emotions of these species.