It’s been ten days or so since the first two eagle chicks have hatched. They have grown and become much more active.
The third egg, though, is probably not going to hatch. Today, the mother eagle stopped brooding the egg entirely.
Even if the last egg did hatch, the chicks get fed on the basis of who has their mouth open the biggest. The two chicks in the nest now would out compete the late comer, and it would starve.