This next photo the pair at 21 days old. They are just beginning to learn to balance, and their faces are beginning to show the characteristic heart shape for which their species is known.
At 29 days of age this basketful of babies is beginning to show more awareness of their surroundings, and is beginning to move about a bit.
At 33 days they are definitely more aware of their surroundings, especially if they spot their caretaker--who they perceive as a source of food.
At 42 days they are beginning to sprout their "big boy (or girl)" feathers, and are beginning to take on more of the appearance of a "real" barn owl.
At 49 days they are more fully feathered, but still have quite a bit of their baby down feathers. They are now able to perch on branches and stumps (if a bit precariously), and are beginning to show quite a bit of curiosity about their surroundings.
At 63 days the young barn owl is almost indistinguishable from the adults of its species, although he still has quite a lot to learn.
The young fledge at 50 to 70 days of age, performing their first flight. They return to the nest to roost, for 7 to 8 weeks more. They become independent at about 3 to 5 weeks after begin flying.