Aquila chrysaetos canadensis – Commonly known as the American golden eagle. Occupies the species’ entire range in North America, which comprises the great majority of Alaska, western Canada and the Western United States. The species is found breeding occasionally in all Canadian provinces but for Nova Scotia. It is currently absent in the Eastern United States as breeding species east of a line from North Dakota down through westernmost Nebraska and Oklahoma to West Texas. The southern limits of its range are in central Mexico, from the Guadalajara area in the west to the Tampico area in the east. It is the subspecies with the largest breeding range and is probably the most numerous subspecies, especially if A. c. kamtschatica is included. Male wing length is from 59.1 to 64 cm (23.3 to 25.2 in), averaging 61 cm (24 in), and female wing length is from 60.1 to 67.4 cm (23.7 to 26.5 in), averaging 65 cm (26 in). The average wingspan in both sexes is about 2.04 m (6 ft 8 in). Males weigh from 2.5 to 4.47 kg (5.5 to 9.9 lb), averaging 3.48 kg (7.7 lb), and females typically weigh from 3.6 to 6.4 kg (7.9 to 14.1 lb), averaging 4.91 kg (10.8 lb). The race does not appear to follow Bergmann’s rule (the rule that widely distributed organisms are larger-bodied further away from the Equator), as specimens of both sexes from Idaho had a mean weight of 4.22 kg (9.3 lb) and where slightly heavier than those from Alaska, with a mean weight of 3.76 kg (8.3 lb). It is medium-sized, being generally intermediate in size between the nominate and A. c. homeyeri but with much overlap. It is blackish to dark brown on the back. The long feathers of nape and top-neck are rusty-reddish and slightly narrower and darker than in the nominate race.