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.
Soon...