Which endangered animal is the source of the world's finest, lightest, warmest and most expensive wool-the shahtoosh?

Step-by-step solution

Shahtoosh comes from the short, warm fleece of the rare Tibetan antelope (Pantholops hodgsonii - Chiru), a species found almost exclusively in the Changtang area of Tibet, on the Tibetan Plateau. It takes four animals to provide enough wool for just one shahtoosh shawl or scarf. Related Theory Despite legal protection of the highest order, the population of chiru is constantly on the decline and today the species is extremely endangered.