House bird&＃39;s nest are bird&＃39;s nests built in swift houses and used by swifts for nesting. Swiftlets build their nests on the beams and walls in these houses, resulting in a slight taste of sawdust in such bird&＃39;s nests. Houses used by swiftlets to build nests are known as swift houses.Workers check the bird&＃39;s nests on a regular basis and will only harvest them when the time is right. As bird&＃39;s nests are covered with feathers and other impurities, it is necessary to send them for cleansing at the bird&＃39;s nest factory where feathers and other impurities are removed. House bird&＃39;s nests are higher in quality, with less feathers and less impurities.