Nesting instinct. Nesting behaviour refers to an instinct or urge in pregnant animals caused by the increase of estradiol (E2) to prepare a home for the upcoming newborn(s). It is found in a variety of animals such as birds, fish, squirrels, mice and pigs as well as humans.
Nest, eggs and young. Like the Osprey and the Bald Eagle, the Golden Eagle is a champion nest-builder, at least in terms of size. Golden Eagles construct a huge platform of sticks, which they line, or pad, with thinner branches and even hair and grasses.hese large birds sometimes build their nests in trees or might use man-made structures, such as an electricity pylon. In Alaska, some Golden Eagles were documented nesting on the ground., but most often they nest on large ledges on cliff faces. Golden Eagles may use the same nest over many breeding seasons.
Both the male and the female build the nest behind loose bark, cladding on a building, or ivy. The nest is made from twigs, grass, and moss, and lined with feathers. The eggs are about 16 mm by 12 mm. They are smooth and non-glossy, and white and fine reddish-brown speckling. The female incubates the eggs by herself, but both parents feed the altricial young after they have hatched.