Here is the owlet testing his wings (photo 1) and staring at an insect (photo 2) in the box preparing for his exit.
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The owlets are beginning to be able to climb up to the window and look out for very brief periods. Since midnight last night, an owlet got into the window about 3 times. They are also developing wing feathers. They spend some time flapping in the box, but mainly when they are trying to balance themselves climbing up. In the next few days, they will be flapping their wings and testing out their flight muscles. The eldest probably has fewer than 10 days left in the box, so he needs to get ready.