Tawny Owls nest in hollows of trees but take readily to nest boxes. The clutch varies from two to five round white eggs depending on calculation of food supply. They do not breed if there is a shortage of food. It takes a month from the start of incubation for the young to hatch, several days apart. At first their eyes are bright blue and turn brown when 16 – 20 days old. The Owlets fledge at five weeks old, then roost in low dense foliage of trees or bushes. The Owlets stay in their parents’ territory for 10 – 12 weeks, dependent on their parents for food, before being forced out to find their own territories.