This March 2019 video from the USA says about itself:
Injured Owl Rescued | Cute Saw-Whet Owl | Released Back into the Wild
An owl crashed into our window today and was injured. Watch as the injured owl is rescued and then flew around our house.
We thought this was a baby owl, possibly a great horned owl baby, but we found that this is a Northern Saw-Whet Owl, which is the smallest owl in North America. This was an adult owl but it was stunned after smashing into my window and was laying out in the cold snow and looked like it was going to die. The injured owl was rescued by my daughter who placed it into a box in the house, away from predatory cats that live outside (not my cats).
Soon the owl recovered and flew across our living room to another window and then back to another window and landed right next to my cat. It is amazing that my cat was so confused that he did not even try to attack the owl. Our cat was absolutely bewildered and just sat there as the owl flapped its wings and landed ON the cat. We released the owl back to the outdoors and it landed on a table outside. Soon it flew off to a nearby coniferous tree where is sat safely and recovered the rest of the day.
From the Cornell Lab of Ornithology in the USA today:
Meet the Cutest Owls in North America—and the Banders Who Study Them
A Northern Saw-whet Owl could fit in the palm of your hand, but it’s a predator through and through, with a fierce gaze and blazing yellow eyes. For decades these secretive owls were scarcely known at all. Then came Project Owlnet, a grassroots banding program that discovered these tiny mousers are actually quite common and widespread. Author and Owlnet veteran Scott Weidensaul takes you out for a night of banding in our Living Bird story.
Saw-whet Owls in Your Backyard? NestWatch has custom nest box plans just the right size for this little owl (and more than 50 other species, too).