<P> Eastern imperial eagles generally prefer to construct a nest in a tree which is not surrounded by other trees, so that the nest is visible from a considerable distance, and so that the occupants may observe the surroundings unobstructed . Tree branches are taken in order to build the nest, which is upholstered with grass and feathers . Very rarely it nests on cliffs or the ground . </P> <P> In March or April the female lays two to three eggs . The chicks hatch after about 43 days and leave the nest after 60--77 days . Often, however, only one will survive to leave the nest, with the others dying before becoming fully fledged . In at least a part of its range, more than a third of all nesting attempts are entirely unsuccessful . </P> <P> The eastern imperial eagle feeds mainly on hares, hamsters and pheasants as well as a variety of other birds and mammals . </P>

Where does the eastern-most population of the imperial eagle breed