Other subspecies that have been described such as Walter Koelz's pileatus (described from the Lushai Hills) and insulae (from Sri Lanka) are not considered valid.
Christians are mostly found among the tribal communities of the state such as the Tripuri, Lushai, etc.
Other clans or ethnic people in this group are the Thadou (Kuki), Hmar, Lushai (Mizo), Paite, Simte, Vaiphei, and Zou.
Bright was also known for his research on the native American languages Nahuatl, Kaqchikel, Luiseño, Ute, Wishram, and Yurok, and the South Asian languages Lushai, Kannada, Tamil, and Tulu.
As can be seen from the name Zo ("of the hills") and Mizoram ("people hill country"), Zo among the Northern Kukish languages is closely related to the Central Kukish languages such as the Lushai or Mizo language (endonym in Lushai is Mizo ṭawng), the main language of Mizoram.