Golden eagles are a part of the Aquila genus, there are some sixteen species of aquila including Bonelli’s Eagle Verreaux’s Eagle Booted Eagle and the Tawny Eagle. You maybe able to tell if the Golden eagle is juvenile or not, being the juvenile has white patches at the base of the secondaries and inner primaries and also two thirds of the tail are also white viewable when the bird is in flight.
There are six recognised sub species within its global range which are Aquila chrysaetos chrysaetos, A. c. homeyeri, A. c.daphanea ( the biggest of the sub species), A. c. kamtschatica, A. c. canadensis and A. c. japonica (the smallest of the sub species). I’ve spoke to a Eagle Falconers which say there’s a further eight subspecies although these perhaps of subspecies of subspecies of the Golden eagle.
The Golden Eagle occupies almost all of the mountainous regions in the north hemisphere, if forests are close by they will need to be sparse otherwise if to dense it will handicap the eagles hunting ability.
They will prey upon animals like rabbit hare partridge pheasant and in the warmer climate reptiles, and will feed on carcasses like deer and sheep.
Golden eagles in time will build a choice of nests then continue using these nests making the nest larger and larger each time it’s used, some have been listed at being 5m tall and 1.5 m in diameter. They’ll build the nest so that at the warmest part of the day the nest isn’t in direct sun light as to not over heat the nest and most of the time they’ll use a cliff to construct a nest as opposed to a tree and on occasion a man made structure.