Parts of a common feather Down feathers, unlike contour feathers, may be found on all parts of a bird's body. They have an extremely short rachis, so the barbs branch from almost the same point near the top of the shaft. The barbules of a down feather have no hooks. Thus, the vane is loose and fluffy. Functions of feathers.
Feathers enable a bird to fly and help it maintain a constant body temperature.
Feathers also may provide coloring that helps the bird hide from its enemies or attract a mate. Although feathers are remarkably durable, they gradually wear out. Birds shed their feathers and grow a new set at least once a year. This process is called molting. How people use feathers.