Barn Owl owlet growth and development Egg to Owl in 63 days – images by Barn Owl Trust trustee Frances Ramsden. Buy a greeting card with these amazing Barn Owl photos! 0 days 7 days 14 days 21 days 28 days 35 days 42 days 49 days 63 days Click on a photo to scroll through the gallery. Click on the black background or press esc to return to this page. Barn Owl nests and eggs. Barn Owl nestlings. Barn Owl fledglings. Barn Owl photos.