down feather painted with another color; the feathers were generally those of a crow, which was sacred to the Ghost Dance, or of an eagle, which was sacred to all tribes. Zuni prayer sticks were also made using eagle down. While eagle feathers belonged to the Sun Priest, who planted them to the sun, other priests could use them if rain was needed, as the down is said to suggest "fleecy clouds that gather on the horizon before rain". The Hopi rubbed eagle down feathers over rattlesnakes being collected for their Snake Dances, in an effort to soothe and calm the reptiles. Anglers who fly fish have long used the down feathers of waterfowl for the construction of fishing lures. Because they are white, down feathers can be easily dyed a variety of colors. They are used to make the bodies, tails and wing casings of the flies. Historically, much of the down used for the flies came from the wing and tail of the marabou stork; these feathers were also popular with the millinery and dressmaking trades. Though it is still called by the same name, today's "marabou" (sometimes spelled "marabout"), comes from domestic turkeys, as marabou storks are protected. For centuries, humans across the globe have used down feathers for insulation. Russian documents from the 1600s list "bird down" among the goods sold to Dutch merchants, and communities in northern Norway began protecting the nests of eider ducks as early as 1890. Eiders are still "farmed" by people in Iceland, Scandinavia and Siberia. The birds are provided with nest sites and protected from predators, and down is collected intermittently during the nesting season without harming the nests or female ducks. The first collection is made roughly halfway through the incubation period, when some of high quality down is removed per nest. When the eggs have hatched and the young have left the area, the remaining down and breast feathers are gathered, typically resulting in another of lower quality feathers per nest. In general, 50–60 nests will produce about one kilogram (2.2 pounds) of down feathers. No more than four tonnes of eiderdown is collected from wild nests each year. Approximately 70% of that harvest is from Iceland. According to the International Down and Feather Bureau, eiderdown contributes only a small, but lucrative, portion of the world's total down production, estimated at 175,000 tonnes annually. An eiderdown duvet requires