Until then, bird watchers may confuse it with other birds, such as the Turkey Vulture and Golden Eagle. The beak and talons grow continuously, because they are made of keratin, the same substance as our hair and fingernails. Fish and Wildlife Service, Bald Eagle. Eagles Adult bald eagle have sharper vision than people, and their field of vision is wider. The feathers weigh twice that much. Multiple legends in Japan refer to a male and female Adult bald eagle duck getting separated and using supernatural means such as transforming into humans to be reunited.