Reier and I spend a fair amount of time in an off leash dog park in south Minneapolis. A family of Barred Owls has faithfully raised young there for at least five years that we know of. The youngsters are easy to identify from their parents - their feathers still have that "fuzzy" look, and the feathers on their faces have not completely grown in yet. They are adult-sized, and were at about 5-6 weeks old. They also can be heard making a low whistle, which is their food-begging call.