Found this tidbit on http://baldeagleinfo.com/eagle/eagle-myths.html
" For those of you ...wondering if it's true that an eagle goes into seclusion, plucks all of its feathers, sheds its beak and talons, and then renews itself, is a myth. An eagle's beak and talons grow continuously, because they are made of keratin, the same substance as our hair and fingernails. Eagles molt in patches, taking almost half a year to replace feathers, starting with the head and working downward. Not all feathers are replaced in a given molt. An eagle without feathers, talons, and a beak would die of starvation and exposure."