Wind-riders were creatures which lived above Vulcan's high deserts. Their delicate, translucent bodies were too frail to ever touch the ground. (TOS novel: The Entropy Effect) They had glassy hollow bones, tissue-thin skin and transparent fur. They spent their entire lives in the air, hunting, mating, giving birth and dying. No one understood how wind-riders were able to survive Vulcan's harsh environment. Few ever saw the rare creature, although James T. Kirk saw one in 2286. (TOS novelization: Star Trek IV: The Voyage Home) Sarek had only seen a few wind-riders in his long lifetime. (TNG short story: "Last Words")