Actually, I have never raised a young Barn Owl, but when I acquire one, I will turn it over to my Wife, who is a Bird and Desert Tortoise fancier.
She takes care of all the Avian species that frequent our High Desert homestead, including Turkey Vultures (some with 7-foot wing spans), Ravens (3-foot wing spans), Cooper's Hawks (a femele lives in the tall pine next door), a Woodpecker (who is a frequent noisemaker), Goldfinches, Wrens, Hummingbirds, and even the common Sparrows, who are frequent prey to our Cooper's Hawk.
Bad Order