The bill is dark at the tip, fading to a lighter horn color, with the waxy top of the beak, called a cere, colored yellow. In addition, some birds have white epaulettes on the upper part of shoulder feathers on each wing. Tarsal feathers range from white to dark brown. Adults are primarily brown, with gold on the back of the crown and nape, and some grey on the wings and tail. Sexes are similar in plumage but display the typical reversed sexual dimorphism of raptors, in which the female is much larger than the male. Its size is variable: it ranges 28-33 inches in length, has a wingspan of 6-7 feet, and weighs 7 to 13 pounds. The golden eagle is a large, dark brown raptor with broad wings. The largest golden eagle nest on record was 20 feet tall, 8.5 feet wide. Nests are huge, averaging some 5-6 feet wide, and 2 feet high, enclosing a bowl about 3 feet by 2 feet deep.Diving from great heights, they have been clocked at close to 200 miles per hour. Golden eagles possess astonishing speed and maneuverability for their size.Although capable of killing large prey such as cranes, wild ungulates, and domestic livestock, the golden eagle subsists primarily on rabbits, hares, ground squirrels, and prairie dogs.
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