An owl can grasp its prey with deadly effectiveness; anything from a field mouse to a squirrel. They have razor-sharp talons which dig into the victim, puncturing whatever organ may be in its path. Also, all owls have outside "toes" that pivot forward and backward, making it adept at conforming its lethal grasp to the exact size of the prey.
Here in north Texas, frequently-present owls are the Great-horned, Barn, Screech and Barred.
Woodpeckers frequently hammer on a house's siding; often it's the Downy Woodpecker. If the siding's metal, or he's hammering on metal flashing, it can be annoyingly loud. He's sometimes looking for insects; but he's discovered that his hammering can be heard for great distances, by other woodpeckers. It tells other males to stay out of "his" territory.