Owls are just full of hot air
Well, not quite, but the majority of an owl’s head is feathers. These feathers not only provide insulation, but;
They act as sonic dishes! The two hemispheres of feathers on either side of an owl’s face are arranged, not to look direct your attention to their most flattering features, but to direct sound to their ears.
Without the external ears that many mammals have (think of a dog or cat pricking its ears in the direction of a sound), the nocturnal owl needs a way of picking up as much sound as possible. These ‘satellite dishes’ pick up sound accurately enough to help a barn owl like the one above zero in on a mouse scurrying away in extremely low light.