Bird's feathers, also known as PLUMAGE, are the feathers that cover a bird's body. PLUMAGE is an important part of a bird's anatomy, providing insulation, waterproofing, and protection from predators. It also helps birds to fly, as the feathers create lift when air passes over them. PLUMAGE can also be used for display purposes, such as courtship or territorial displays. The color and pattern of a bird's PLUMAGE can vary greatly between species, and even within a species.