A fur-covered Xindi species descended from tree-dwelling ancestors, calm and cautious by temperament, who join the Primates in supporting Archer before the Xindi Council.
The Xindi-Arboreals are one of the five surviving Xindi species in the third season of Enterprise. They are covered in long hair, have dark eyes and long claws, and resemble upright sloths. They dislike water and are generally regarded as the least aggressive of the Xindi.
Their representative on the Council is Jannar, an ally of the Primate scientist Degra. Arboreals also run industrial sites. In the episode Shipment, Archer finds an Arboreal named Gralik in charge of a plant refining kemocite for the weapon. Gralik had no idea what the material was for and agrees to sabotage the consignment.
When the Council splits over the evidence Archer presents, the Arboreals side with the Primates against the Reptilians and Insectoids. Jannar helps to persuade the Aquatics, and stays with the alliance after Degra is killed.