Selected 20 species burbles of the downy feather of birds (10 species in Galliformes phasianidae and the other 10 species), and observed the downy feather by means of the microbservation and measure.

• 摘要选择20种（鸡形目雉科10种和不同目10种）鸟羽，观察分析它们绒羽羽小枝的显微结构。