http://en.wikipedia.org/wiki/Golden_Eagle
The Golden eagle is a large, dark brown raptor with broad wings. Its size is variable: it ranges from 70 to 97 centimetres (2 ft 4 in to 3 ft 2 in) in length, has a wingspan of 150 to 230 centimetres (4 ft 11 in to 7 ft 7 in), and weighs 3 to 7 kilograms (7 to 15 lb).[2][3][4] The maximum recorded wingspan for a Golden Eagle was 2.77 m (9.05 ft) for a female Asian golden eagle.[5] Sexes are similar in plumage but are considerably dimorphic in size, with females much larger than males.[6] Adults are primarily brown, with gold on the back of the crown and nape, and some grey on the wings and tail.[7] tarsal feathers range from white to dark brown. In addition, some birds have white "epaulettes" on the upper part of each scapular feather tract.[8] The bill is dark at the tip, fading to a lighter horn color, with a yellow cere.[9]
Juveniles have a darker, unfaded color, white patches in the remiges which may be divided by darker feathers,[10] and a large amount of white on the tail with a black terminal band.[6] Occasionally upper wing feathers of juveniles are also white, or birds lack white on the wing entirely. As the bird ages, the amount of white on wings and tail diminishes, and adult plumages is usually acquired by the fifth year.[10]