Kloorians
Kloorians are a fictional species featured in the science fiction television series "Star Trek: The Next Generation." They first appeared in the episode "The Dauphin." Kloorians are depicted as a humanoid species native to the planet Kloros. Their most notable characteristic is their dual biological nature. Kloorians possess a distinct biological sexual dimorphism, meaning individuals appear as either male or female. However, their species undergoes a unique transformation as they age, transitioning from one biological sex to the other. This process is a natural part of their life cycle. The societal implications of this biological trait were explored in "The Dauphin," where the protagonist, Anya, was a Kloorian. The series did not delve deeply into the specifics of their physiology beyond this transformative aspect. Their home world, Kloros, was described as a temperate planet. Kloorians are generally presented as a peaceful and technologically advanced civilization, consistent with many species encountered by the United Federation of Planets. Their cultural practices and further biological details beyond their sex-changing nature remain largely unexplored in the "Star Trek" canon.