During the first four weeks right after hatching, 1 review located 3 younger acquired an average of above an ounce (33.3 grams) for every working day. From 29 days to fledging, the younger gained an typical of just under half and ounce (12.7 grams) per working day, 1.6 per cent of system mass. These owls can continue to be non-territorial for a number of years and the proportion of these non-breeding "floaters" can access 40 p.