The female incubates the eggs for approximately 35 days. The male shares in incubating the eggs or brings food to his mate. There is almost always at least one adult on the nest for the first two weeks. Eaglets are never left unattended for long. Though they may not be on the nest proper, the adults are never far away.
Eagles tend to use the same nests year after year.
Each spring, they repair and refurbish the nest until it meets their approval. These continual additions to the nest enlarge it to enormous proportions. One observed nest measured eight feet in diameter and probably weighed over two tons. If an eagle's nest is destroyed for any reason, they are known to build another very close by. Once the nest has been made eggworthy the female lays one to three eggs, each a day apart.