do eagles lay eggs after beginning incubation on the first one
One to three eggs are laid by bald eagles though there is at least a record of four eggs appearing in a Montana nest. Other instances of 4 eggs were known to result from two females laying in the same nest during the same season. Each egg is laid about 3 days apart. Incubation starts with the laying of the first egg. This is likely to offer full protection to the egg from encroaching crows or ravens and to ensure that the eggs don't hatch at the same time. Each egg also takes 35 days of incubation -- plus or minus a few hours. This means that the chicks hatch 3 days apart.