The Zuna tribe is a race living deep into the desert (deeper even than the Gerudo people). They appear to be desert cousins of the Dekus, or in other words, cactuses people. It is not easy to tell for certain though, because (due to their habitat) contact with them has always been scarce and like the Gerudo they wear large light (but sleeveless) clothes, and veils over their faces, as well as turbans.
The Zuna were among the oldest civilizations in Hyrule as they descend from the builders of the desert pyramids that are more ancient than memory. Now however they are very few in number and live in tents as nomads. They are extremely carefree and friendly with the few visitors they get and can be hurt and offended if such kindness is not returned, but even so they won't cause any incidents. They love to perform sand massages on their visitors, though they still ask for payment, but even the kindest ones have to make a living. They also hang out in caves and still know their way inside the pyramid which is considered a deadly place by all others. When a Zuna is met in such places, he or she will usually share some advice with the fellow explorer.
Young Zuna are told all that is remembered about their past and the pyramids they built, but because this seems to be a strictly oral tradition, much knowledge appears to be lost to them.
What we do know, is that inside their great pyramid resided an evil force, a trident supposedly made by the Dark Tribe to designate and give power to their (future?) leader, the King of Darkness. Whether this means that the ancient Zuna were affiliated to the Dark Tribe can't be told, but the fact that they have descendants not trapped inside the mirror seems to imply the contrary (besides, said descendants are such kind, naive people that it seems hardly conceivable). Perhaps the pyramid was taken over by the Dark Tribe? Interestingly, even though the Zuna built it, the pyramid is sacred ground to the Gerudo people, so this may mean the Zuna did not build pyramids for themselves, but worked as architects and builders for others (and this may also mean a certain Gerudo was part of the Dark Tribe...)