Golden eagles are part of the Aquila genus, there are some sixteen species of aquila such as 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 bottom of the secondaries and inner primaries and also two thirds of the tail will also be white viewable once the bird is in flight.
There are six recognized 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 maybe of subspecies of subspecies of the Golden eagle.
The Golden Eagle occupies almost all the mountainous regions in the north hemisphere, if forests are close by they will need to be lean differently if to dense it will handicap the eagles searching ability.
They will prey upon animals like rabbit hare partridge pheasant and in the warmer weather reptiles, and will feed on carcasses like deer and sheep.
Golden eagles in time will build a selection of nests then carry on using these nests making the nest larger and larger each time it’s used, some have been recorded at being 5m tall and 1.5 m in diameter. They’ll build the nest so that in the warmest portion 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 build a nest rather than a tree and sometimes a manmade structure.