The golden eagle rules the widest eagle range on Earth
Aquila chrysaetos is the most widely distributed eagle, dark brown with a golden nape, hunting hares, rabbits, and ground squirrels across the Holarctic. Territories can span two hundred square kilometres. Linnaeus named it Falco chrysaetos in seventeen fifty-eight; Brisson moved it to Aquila in seventeen sixty.
Pairs are monogamous and may stay together for years or life. They nest on cliffs and high ledges, returning across breeding seasons, with most activity in spring. Females lay up to four eggs and incubate about six weeks; usually one or two young fledge after roughly three months and wander for four to five years before claiming their own range. Human settlement has erased them from many former haunts, yet they still breed across large tracts of Eurasia, North America, and parts of North Africa—the largest and least numerous of five true accipitrids shared by Palearctic and Nearctic.
Genetics places golden eagles with Verreaux's, Gurney's, and wedge-tailed eagles, plus—surprisingly—Bonelli's eagle and the African hawk-eagle once parked in Hieraaetus. Six living subspecies differ mildly in size and plumage along clines; some genetic work collapses them toward just two: a Eurasian chrysaetos group and a canadensis group. Feathered tarsi mark them as "booted" eagles among Accipitridae.
European nominate birds average about three point seven kilograms for males and five point two for females, with male wingspans near two metres. Himalayan berkuts are the heaviest on average—males around four kilograms, females six point three—and one captive female reached an authenticated two point eight one metre span. Japanese birds are the smallest and darkest, males near two point five kilograms. For centuries falconers prized the species, and tribal cultures treated its hunting skill with mystic reverence; Western United States and Western Palearctic populations rank among the best-studied raptors anywhere.
Source: Golden eagle
