Wind-rider

Wind-riders were creatures which lived above 's high deserts. Their delicate, translucent bodies were too frail to ever touch the ground. 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. Sarek had only seen a few wind-riders in his long lifetime. (SS TNG (Last Words))