Jeff, One possible way of telling juvenile/immatures from adults is by their blue- gray eyes. Once adults, they become black(ish). A few species of owls young have this feature (blueish-gray eyes) including the Barred. Fledglings do have that downy wispy look to them, but grow out their "adult" feathers soon. I don't think they have a strictly juvenile plumage otherwise, but look for the different eye color. I also don't know when the get the darker colored eyes, but if they're young, the eye color is obvious. Warblerick@aol.com