By 10-20 days after hatching, a thick buff-colored plumage replaces hatchling down. Ten-day-old chicks are already mobile and quickly approach the female for food. The 2nd and especially the 3rd chick to be born must be very aggressive to survive.
The first feathers to appear are the rusty-golden pinfeathers on the head and neck. Darker body feathers develop slightly later, and primaries, secondaries, and outer feathers of the wings and tail emerge at 20-25 days.
At 30 days old, they have reached 70- and 80% of their total body weight
The highest quantities of food are brought to the nest once the nestlings are 40 days old. At this period, Ozzie will be bringing up to 6 fish to the nest per day.
At the time of fledgling, parents will make food transfer to the young increasingly difficult and attempt to lure the young progressively further from the nest site.
Age at first flight = 50-55 days
– A young bird that has recently emerged from its egg.
– A bird that is too young to leave its nest.
– To develop wing feathers that are large enough for flight
– A young bird that has just fledged.
– A general term for any non-adult plumage, including juvenile plumage.
– A bird in juvenile plumage.
– The first plumage of “true” or vaned (nondowny) feathers; often the plumage in which a bird fledges.
– A bird’s coat of feathers