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The common owl, bubo bubo, squinted his eye and looks ahead. Portrait. Close-up.

Beautiful tawny owl (Strix aluco) sitting in an old oak tree.

Short-eared Owl (Asio flammeus) - nocturnal bird

Tawny owl (Strix aluco), also called the brown owl

$An Owl's daily activity begins with preening, stretching, yawning and combing its head with its claws. The plumage is often ruffled up, and claws and toes are cleaned by nibbling with the beak. The Owl will then leave its roost, sometimes giving a call (especially in breeding season)\n\nLike most owls, the barn owl is nocturnal, relying on its acute sense of hearing when hunting in complete darkness. It often becomes active shortly before dusk and can sometimes be seen during the day when relocating from one roosting site to another. In Britain, on various Pacific Islands and perhaps elsewhere, it sometimes hunts by day. This practice may depend on whether the owl is mobbed by other birds if it emerges in daylight. However, in Britain, some birds continue to hunt by day even when mobbed by such birds as magpies, rooks and black-headed gulls, such diurnal activity possibly occurring when the previous night has been wet making hunting difficult. By contrast, in southern Europe and the tropics, the birds seem to be almost exclusively nocturnal, with the few birds that hunt by day being severely mobbed.\n\nBarn owls are not particularly territorial but have a home range inside which they forage. For males in Scotland this has a radius of about 1 km (0.6 mi) from the nest site and an average size of about 300 hectares. Female home ranges largely coincide with that of their mates. Outside the breeding season, males and females usually roost separately, each one having about three favored sites in which to conceal themselves by day, and which are also visited for short periods during the night. Roosting sites include holes in trees, fissures in cliffs, disused buildings, chimneys and haysheds and are often small in comparison to nesting sites. As the breeding season approaches, the birds move back to the vicinity of the chosen nest to roost.$

Close-up of an Eurasian eagle-owl yawning

$Taxon name: Powerful Owl (juvenile)\nTaxon scientific name: Ninox strenua\nLocation: Sydney, New South Wales, Australia$

eagle owl isolated on black with one eye closed

Portrait of Tawny owl or brown owl (Strix aluco)

he Southern Boobook is the smallest and most common owl in Australia. Like other owl species, the Southern Boobook is nocturnal

Eurasian pygmy owl in natural habitat. The smallest European owl sits on the moss.

Male Eurasian pygmy owl (Glaucidium passerinum) perching on a deciduous tree.

Northern Harrier (Circus cyaneus) flying over a marsh in search of prey. Delta, B.C., Canada

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