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The rich baritone hooting of the Barred Owl is a characteristic sound in southern swamps, where members of a pair often will call back and forth to each other. Although the bird is mostly active at night, it will also call and even hunt in the daytime. Only a little smaller than the Great Horned Owl, the Barred Owl is markedly less aggressive, and competition with its tough cousin may keep the Barred out of more open woods.

Found almost throughout North America and much of South America is this big owl. Aggressive and powerful in its hunting (sometimes known by nicknames such as 'tiger owl'), it takes prey as varied as rabbits, hawks, snakes, and even skunks, and will even attack porcupines, often with fatal results for both prey and predator. Great Horned Owls begin nesting very early in the north, and their deep hoots may be heard rolling across the forest on mid-winter nights.

This robin-sized nightbird is common over much of the east, including in city parks and shady suburbs, where many human residents are unaware they have an owl for a neighbor. The owl spends the day roosting in holes or in dense cover, becoming active at dusk. Despite the name, screech-owls do not screech; the voice of this species features whinnies and soft trills.

Cowboys sometimes called these owls 'howdy birds,' because they seemed to nod in greeting from the entrances to their burrows in prairie-dog towns. Colorful fiction once held that owls, prairie-dogs, and rattlesnakes would all live in the same burrow at once. A long-legged owl of open country, often active by day, the Burrowing Owl is popular with humans wherever it occurs, but it has become rare in many areas owing to loss of habitat.

A large, powerful owl of the high Arctic tundra, colored for camouflage during northern winters. In summer it may be nomadic, concentrating and nesting where there are high populations of the small rodents called lemmings. At other times it takes a wide variety of prey, including birds as big as geese. During some winters, large numbers of Snowy Owls appear south of the Canadian border; those that stop in towns and cities invariably cause a stir and attract media attention.

Inconspicuous but locally very common is this little owl. In the varied terrain of the west, its haunts range from coastal forests in southeastern Alaska to cactus groves in the Arizona desert, and it is often found in suburban areas. Until the 1980s, Western and Eastern screech-owls were considered to belong to the same species because they look so similar; however, their voices differ, and they apparently recognize their own kind by sound.

Birders who prowl through conifer groves in winter sometimes find this round-headed little gnome perched there, sitting still as if to avoid notice. Avoiding notice is a task at which this owl often succeeds; it is overlooked in many places where it occurs. Late at night in the breeding season, males give a rhythmic tooting song that may go on for hours with scarcely a break. The bird was named for this song, which reminded settlers of the sound of a whetstone sharpening a saw.

Easier to see than most owls, the Short-ear lives in open terrain, such as prairies and marshes. It is often active during daylight, especially in the evening. When hunting it flies low over the fields, with buoyant, floppy wingbeats, looking rather like a giant moth. Aside from its North American range, it also nests in South America and Eurasia, and on many oceanic islands, including Hawaii.