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Spring Phenology of Eagles
Watch for these events to occur on the nesting grounds.

Date Behavior
  Arrival on Nesting Territory:
Migratory individuals only. Males and females of mated pair seem to appear on territory within a short time of each other.
  Defending Territory:
Watch for skirmishes with other eagles and, during nesting, with other birds. Intraspecific aggression less noticeable when pair has been established for many years.
  Courtship:
Displays involve aerial acrobatics and tumbling, but are rarely seen.
  Nest Building:
Nests made of sticks lined with softer grasses and mosses. The same nest is often used for many years. Both male and female build.
  Mating:
Eagles are monogamous, meaning males and females have only one mate. Pairs stay together for life. If one dies, the remaining bird finds a new mate and usually carries on in the same nesting territory.
  Egg Laying:
First laid several weeks after arriving at nest site. Typicially, two eggs laid, the 2nd egg 1-2 days after first. If a 3rd egg, it's often laid a full week after 1st egg.
  Incubation:
Lasts 34-36 days, begins as soon as 1st egg is layed, "asynchronous incubation." Males and females take turns, but female does bulk of work.
  Hatching:
1st egg hatches before 2nd egg, the same number days earlier as it was laid. Young are semi-altricial when just hatched: immobile, downy, eyes open, fed by parents.
  Nestling Stage:
Lasts 10-12 weeks, both parents share feeding responsibilities. Older eaglets more likely to survive due to size/age differences due to competition for available food.
  Fledging Stage:
In years with plentiful food, very commmon for 2 or even 3 to fledge. This stage lasts 4-6 weeks, both parents continue to feed, but young also forage on own.

 

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