This adorable forehead belongs to a Boreal Owl, also known as Tengmalm's Owl.
Description from All About Birds
In the dark of the night, the small Boreal Owl comes alive in the spruce and fir forests of northern North America and Europe. This bright-eyed, square faced owl sits and waits on a perch for small mammals and birds before gliding down talons first to grab it. From late winter through spring, its quick, hollow hooting sounds across the dark forest as the male calls for a mate. They spend the year in boreal forests, occasionally making their way farther south in years of prey scarcity.
Pretty much, if I was shooting this with my D850 and 200-500mm at 500mm and f/7.2 and the owl was 20ft away the total depth of field would be 2.3 inches 5.8cm. That's half that in front of the plane of focus and half behind. That's about as shallow as I would want to go and so looking at that image I think it's shot at maybe 300mm