bg aves

(Strigidae)

Typical Owls

Совові

The true owls or typical owls (family Strigidae) are one of the two generally accepted families of owls. This large family comprises 230 living or recently extinct species in 24 genera. The Strigidae owls have a cosmopolitan distribution and are found on every continent except Antarctica.

While typical owls (hereafter referred to simply as owls) vary greatly in size, with the smallest species, the elf owl, being a hundredth the size of the largest, the Eurasian eagle-owl and Blakiston’s fish owl, owls generally share an extremely similar body plan. They tend to have large heads, short tails, cryptic plumage, and round facial discs around the eyes. The family is generally arboreal (with a few exceptions like the burrowing owl) and obtain their food on the wing. The wings are large, broad, rounded, and long. As is the case with most birds of prey, in many owl species females are larger than males.

Because of their nocturnal habits, they tend not to exhibit sexual dimorphism in their plumage. Specialized feathers and wing shape suppress the noise produced by flying, both taking off, flapping and gliding. This silent flight allows owls to hunt without being heard by their prey. Owls possess three physical attributes that are thought to contribute to their silent flight capability. First, on the leading edge of the wing, there is a comb of stiff feathers. Second, the trailing edge of the wing contains a flexible fringe. Finally, owls have downy material distributed on the tops of their wings that creates a compliant but rough surface (similar to that of a soft carpet). All these factors result in significant aerodynamic noise reductions. The toes and tarsi are feathered in some species, and more so in species at higher latitudes. Numerous species of owls in the genus Glaucidium and the northern hawk-owl have eye patches on the backs of their heads, apparently to convince other birds they are being watched at all times. Numerous nocturnal species have ear-tufts, feathers on the sides of the head that are thought to have a camouflage function, breaking up the outline of a roosting bird. The feathers of the facial disc are arranged in order to increase sound delivered to the ears. Hearing in owls is highly sensitive and the ears are asymmetrical allowing the owl to localise a sound in multiple directions. Owls can pinpoint the position of prey, such as a squeaking mouse, by computing when the sound from the object reaches the owl’s ears. If the sound reaches the left ear first, the mouse must be to the left of the owl. The owl’s brain will then direct the head to directly face the mouse. In addition to hearing, owls have massive eyes relative to their body size. Contrary to popular belief, however, owls cannot see well in extreme dark and are able to see well in the day.

Behaviour

Owls are generally nocturnal and/or crepuscular and spend much of the day roosting. They are often misperceived as ‘tame’ since they allow humans to approach quite closely before taking flight, but in reality they are attempting to avoid detection through stillness. Their cryptic plumage and the inconspicuous locations they adopt are an effort to avoid predators and mobbing by small birds.

Communication

Owls, such as the eagle-owl, will use visual signaling in intraspecific communication (communication within the species), both in territorial habits and parent-offspring interactions. Some researchers believe owls can employ various visual signals in other situations involving intraspecific interaction. Experimental evidence suggests that owl feces and the remains of prey can act as visual signals. This new type of signaling behavior could potentially indicate the owls’ current reproductive state to intruders, including other territorial owls or non-breeding floaters. Feces are an ideal material for marking due to its minimal energetic costs, and can also continue to indicate territorial boundaries even when occupied in activities other than territorial defense. Preliminary evidence also suggests that owls will use feces and the feathers of their prey to signal their breeding status to members within the same species.

Migration

Some species of owl are migratory. One such species, the northern saw-whet owl, migrates south even when food and resources are ample in the north.

Habitat, climate and seasonal changes

Some owls have a higher survival rate and are more likely to reproduce in a habitat that contains a mixture of old growth forests and other vegetation types. Old growth forests provide ample dark areas for owls to hide from predators. Like many organisms, spotted owls rely on forest fires to create their habitat and provide areas for foraging. Unfortunately, climate change and intentional fire suppression have altered natural fire habits. Owls avoid badly burned areas but they benefit from the mosaics of heterogeneous habitats created by fires. This is not to say that all fires are good for owls. Owls only thrive when fires are not of high severity and not large stand-replacing (high-severity fires that burn most of the vegetation) which create large canopy gaps that are not adequate for owls.

Predators

The main predators of owls are other species of owls. An example of this occurs with the northern saw-whet owl that lives in the northern U.S. and lives low to the ground in brushy areas typically of cedar forests. These owls eat mice, and perch in trees at eye level. Their main predators are barred owls and great horned owls.

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megascops atricapilla

(Megascops atricapilla)

Black-capped Screech-Owl

Сплюшка темноголова

Body length: 22–23 cm.
Weight: 115–160 g.

It is found in south-eastern Brazil, south-eastern Paraguay, and extreme north-eastern Argentina. It inhabits a variety of landscapes, especially lowland rainforest and including forest with thick undergrowth, edges, open woodland, and secondary forest.

megascops watsonii

(Megascops watsonii)

Tawny-bellied Screech-Owl

Сплюшка амазонійська

Body length: 19–24 cm.
Weight: 114–155 g.

It is found in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela. It inhabits the interior of lowland rainforest, mostly old growth and mature secondary forest, at elevations of 600–700 m.

megascops roboratus

(Megascops roboratus)

West Peruvian Screech-Owl

Сплюшка чагарникова

Body length: 20–22 cm.
Weight: 144–162 g.

It is found from Santa Elena and Guayas Provinces in southwestern Ecuador south slightly into north-western Peru. It inhabits dry deciduous woodland on mountain slopes and hills, dry coastal scrub and deciduous forest, at elevations of 500–2,100 m.

megascops gilesi

(Megascops gilesi)

Santa Marta Screech-Owl

Сплюшка санта-мартійська

Body length: ≈24 cm.

It is known only from Sierra Nevada de Santa Marta of northern Colombia. It inhabits humid forest, at elevations of 1,800–2,500 m.

megascops sanctaecatarinae

(Megascops sanctaecatarinae)

Long-tufted Screech-Owl

Сплюшка санта-катаринська

Body length: 25–28 cm.
Weight: 155–211 g.

It is found in the southeastern Brazilian states of Paraná, Santa Catarina, and Rio Grande do Sul, in Misiones Province of northeastern Argentina, and in adjoining northern Uruguay. It inhabits sparse woodland, pastures with trees, the edges of dense forest, secondary forest, and woodlots near villages.

megascops roraimae

(Megascops roraimae)

Foothill Screech-Owl

Сплюшка нагірна

Body length: 20–23 cm.
Weight: 91–128 g.

It is found in southern and northern Venezuela, southern Guyana, Suriname, eastern Colombia, eastern Peru, northern Bolivia, and eastern Ecuador. It inhabits dense humid to wet rainforest, at elevations of 250–1,800 m.

megascops centralis

(Megascops centralis)

Chocó Screech-Owl

Сплюшка чокоанська

Body length: 20–27 cm.
Weight: 106–121 g.

It is found from central Panama into north-western Colombia and in a narrow band of western Ecuador. It inhabits the interior and borders of humid primary and secondary forest in lowlands and foothills, at elevations of 1,000–1,575 m.

megascops hoyi

(Megascops hoyi)

Montane Forest Screech-Owl

Сплюшка аргентинська

Body length: 23–24 cm.
Weight: 110–145 g.

It is found from south-central Bolivia’s Cochabamba Department south into north-western Argentina as far as Tucumán Province. It inhabits moist montane and cloud forests characterized by tall trees and abundant epiphytes, at elevations of 1,000–2,800 m.

megascops marshalli

(Megascops marshalli)

Cloud-forest Screech-Owl

Сплюшка Маршалла

Body length: 20–23 cm.
Weight: 105–115 g.

It lives in the Andes of south and central Peru, in the Departments of Pasco, Cuzco, and Puno, as well as in northern Bolivia. It inhabits cloud forest, a humid, mossy landscape with epiphytes, ferns, and a dense understory, at elevations of 1,550–2,580 m.

megascops petersoni

(Megascops petersoni)

Cinnamon Screech-Owl

Сплюшка еквадорська

Body length: 23–24 cm.
Weight: 88–119 g.

It is known only from the eastern slope of the Andes, ranging from southern Ecuador into northern Peru, and occurring locally in northern Colombia. It inhabits humid montane forest at elevations of 1,650–2,450 m.

megascops ingens

(Megascops ingens)

Rufescent Screech-Owl

Сплюшка андійська

Body length: 25–28 cm.
Weight: 134–223 g.

It is found in Bolivia, Colombia, Ecuador, Peru, and Venezuela. It inhabits a wide variety of forest types including the interior and edges of mature evergreen and secondary forests and pastures with scattered trees, at elevations of 1,200–2,500 m.

megascops koepckeae

(Megascops koepckeae)

Koepcke's Screech-Owl

Сплюшка високогірна

Body length: ≈24 cm.
Weight: 112–130 g.

It is endemic to Peru. It inhabits evergreen forests, dry forests, and scrubby areas in intermontane valleys. It occurs at elevations of 1,400–4,500 m.

megascops guatemalae

(Megascops guatemalae)

Guatemalan Screech-Owl

Сплюшка гватемальська

Body length: 22–23 cm.
Weight: 95–150 g.

It is found from northern Mexico to western Panama. It inhabits evergreen, semi-deciduous, and thorn forests, and to a lesser extent, secondary forests and plantations, at elevations of 0–1,500 m.

megascops seductus

(Megascops seductus)

Balsas Screech-Owl

Сплюшка бура

Body length: 24–27 cm.
Weight: 150–174 g.

It is endemic to interior southwestern Mexico. Its range is centered on the valley of the Balsas River from southern Jalisco southeast into central Guerrero. It inhabits arid open and semi-open areas such as deciduous woodland with cactus, thorn forest, and secondary forest, at elevations of 600–1,500 m.

megascops asio

(Megascops asio)

Eastern Screech-Owl

Сплюшка східна

Body length: 16–25 cm.
Weight: 121–244 g.

It is found in eastern North America, ranging from Mexico northward to Canada. It inhabits most types of woodland habitats across its range, and is relatively adaptable to urban and developed areas.

megascops kennicottii

(Megascops kennicottii)

Western Screech-Owl

Сплюшка західна

Body length: 21–24 cm.
Weight: 88–220 g.

It is native to Canada, United States, Mexico, Guatemala, El Salvador, Honduras, Costa Rica, and Nicaragua. Its habitat includes temperate forests, subtropical and tropical montane forests, shrubland, desert, rural fields, and even suburban parks and gardens.

megascops cooperi

(Megascops cooperi)

Pacific Screech-Owl

Сплюшка мангрова

Body length: 20–26 cm.
Weight: 115–175 g.

It is found from eastern Oaxaca and Chiapas in Mexico, south along the Pacific slope into north-western Costa Rica. It inhabits swamp forests and mangroves, arid and semi-arid woodlands and scrub, open areas with scattered trees and cacti, and secondary forest.

megascops barbarus

(Megascops barbarus)

Bearded Screech-Owl

Сплюшка чіапська

Body length: 16–20 cm.
Weight: 63–72 g.

It is found from the highlands of central Chiapas, Mexico south and east into the highlands of central and western Guatemala. It inhabits humid temperate montane forests of various types, including pine-oak, oak, and cloud forests, at elevations of 1,350–2,500 m.

megascops choliba

(Megascops choliba)

Tropical Screech-Owl

Сплюшка неотропічна

Body length: 21–23 cm.
Weight: 97–160 g.

It is found from Costa Rica and Panama south and throughout South America, almost entirely east of the Andes, but not in the far south. It inhabits secondary forests, open woodland, coffee plantations, residential areas, and the borders of terra firme and várzea forests.

megascops albogularis

(Megascops albogularis)

White-throated Screech-Owl

Сплюшка білогорла

Body length: 20–26 cm.
Weight: 130–185 g.

It is found in the Andes of Bolivia, Colombia, Ecuador, Peru and Venezuela. It inhabits the interior and edges of open humid evergreen montane forest and cloud forest and semi-open areas of scattered trees, at elevations of 1,300–3,700 m.

megascops clarkii

(Megascops clarkii)

Bare-shanked Screech-Owl

Сплюшка коста-риканська

Body length: 23–25 cm.
Weight: 125–190 g.

It is found in Costa Rica, Panama, and far north-western Colombia. Its habitat is in mountain forests that are dense and humid, along with the edges of forests and in cloud forests that have an elevation of 900–3,300 m.

megascops trichopsis

(Megascops trichopsis)

Whiskered Screech-Owl

Сплюшка вусата

Body length: 17–19 cm.

It is found from south-eastern Arizona and south-western New Mexico in the United States, south through Mexico, Guatemala, El Salvador, and Honduras to north-central Nicaragua. Its breeding habitat includes dense coniferous or oak woodlands and coffee plantations.

megascops alagoensis

(Megascops alagoensis)

Alagoas Screech-Owl

Сплюшка алагоаська

It is found only in the Atlantic Forest north of the São Francisco River of Brazil, and is threatened by forest fragmentation.

The genus (Megascops) also includes: Xingu Screech-Owl (Megascops stangiae).

pulsatrix melanota

(Pulsatrix melanota)

Band-bellied Owl

Сова рудовола

Body length: 44–48 cm.
Weight: 590–1,250 g.

It is found on the eastern slopes of the Andes, from central Colombia south through Ecuador and Peru to west-central Bolivia. It primarily inhabits the interior of humid montane forests and foothill rainforests, at elevations of 650–2,200 m.

pulsatrix koeniswaldiana

(Pulsatrix koeniswaldiana)

Tawny-browed Owl

Сова вохристоброва

Body length: ≈44 cm.
Weight: 405–670 g.

It is found in Brazil from Espírito Santo state south to northern Rio Grande do Sul and the immediately adjacent areas of eastern Paraguay and northeastern Argentina. It inhabits humid tropical forest, open woodland, and forest dominated by Araucaria evergreens, at elevations up to 1,500 m.

pulsatrix perspicillata

(Pulsatrix perspicillata)

Spectacled Owl

Сова вохристочерева

Body length: 41–52 cm.
Weight: 453–1,250 g.

It is found in forests from southern Mexico and Trinidad, through Central America, and south to southern Brazil, Paraguay, and northwestern Argentina.

lophostrix cristata

(Lophostrix cristata)

Crested Owl

Сова-рогань бура

Body length: 38–43 cm.
Weight: 425–620 g.

It is found in Central America and northern South America. It occurs throughout most of the Amazon Basin, except in the northwestern region. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests, at elevations up to 1,000 m.

strix seloputo

(Strix seloputo)

Spotted Wood Owl

Сова таїландська

Body length: 44–48 cm.
Wing length: 30–36 cm.

It is found in Myanmar, Thailand, Cambodia, southern Vietnam, Peninsular Malaysia, Singapore, Indonesia (Sumatra, Java, and Bawean), and the western Philippines (Palawan and the Calamian Islands). It inhabits plantations, forest clearings, evergreen secondary forests, and forest edges.

strix ocellata

(Strix ocellata)

Mottled Wood Owl

Сова мангрова

Body length: 41–48 cm.

It is fairly common throughout the Indian subcontinent and in the Himalayan foothills of India and southern Nepal. It is found in the plains in gardens and lightly wooded habitats.

strix leptogrammica

(Strix leptogrammica)

Brown Wood Owl

Сова бура

Body length: 45–57 cm.

It lives in coastal woodlands and tropical forests, ranging from India and Sri Lanka to south-western China, and from Myanmar south to Malaysia, Sumatra, and Borneo. It occurs at elevations of 700–4,000 m.

strix aluco

(Strix aluco)

Tawny Owl

Сова сіра

Body length: 37–46 cm.
Wingspan: 81–105 cm.
Weight: 385–800 g.

It has a distribution stretching discontinuously across temperate Europe, from Great Britain and the Iberian Peninsula eastwards to western Siberia. It is found in deciduous and mixed forests, and sometimes mature conifer plantations, at elevations of 0–2,400 m.

strix mauritanica

(Strix mauritanica)

Maghreb Owl

Сова мавританська

Body length: 27–30 cm.
Weight: 325–575 g.

It occurs in north-western Africa from Morocco to Tunisia and Mauritania.

strix nivicolum

(Strix nivicolum)

Himalayan Owl

Сова гімалайська

Body length: 33–40 cm.
Weight: 375–392 g.

The range extends from the Indian state of Himachal Pradesh, Nepal, and south-eastern Tibet eastward to the east coast of China, Taiwan, and Korea, and southward to southern Assam, north-western Myanmar, and northern Vietnam. It occurs at elevations of 1,000–2,700 m.

strix hadorami

(Strix hadorami)

Desert Owl

Сова бліда

Body length: 29–33 cm.

It breeds in Israel, northeast Egypt, Jordan, and the Arabian Peninsula. Its habitat includes desert, semi-desert, rocky ravines, and palm groves. It nests in crevices and holes in cliffs.

strix butleri

(Strix butleri)

Omani Owl

Сова аравійська

Body length: 30–34 cm.

It is found in shrubland and rocky areas of Oman, Iran and the United Arab Emirates.

strix occidentalis

(Strix occidentalis)

Spotted Owl

Сова плямиста

Body length: 41–48 cm.
Wingspan: ≈114 cm.
Weight: ≈600 g.

It is found in western North America, ranging from British Columbia to Mexico. It occurs in a variety of hardwood and coniferous forest habitats, although it prefers closed-canopy, uneven-aged, late-successional, and old-growth forests.

strix varia

(Strix varia)

Barred Owl

Сова неоарктична

Body length: 48–55 cm.
Weight: 468–1,150 g.

It is distributed throughout most of the eastern United States, as well as much of southern Canada. Its habitat consists mainly of old deciduous and mixed forests, and occasionally coniferous

strix sartorii

(Strix sartorii)

Cinereous Owl

Сова мексиканська

Body length: 43–50 cm.
Weight: 469–1,051 g.

It occurs in three disjunct areas. The largest is along the Sierra Madre Oriental between San Luis Potosi in the north and Veracruz in the south. The next largest is a band from Durango south to Michoacán and the third is a relatively small area in Guerrero.

strix fulvescens

(Strix fulvescens)

Fulvous Owl

Сова чіяпська

Body length: 41–44 cm.

It is found in highland regions in the Mexican states of Chiapas and Oaxaca, Guatemala, Honduras, and El Salvador. It imnhabits in montane evergreen pine forests and humid pine-oak forests, and more generally within a cloud forest habitat.

strix hylophila

(Strix hylophila)

Rusty-barred Owl

Сова бразильська

Body length: 35–36 cm.
Weight: 250–395 g.

It is found in south-eastern Brazil from Minas Gerais to Rio Grande do Sul, in south-eastern Paraguay, and in Argentina’s extreme north-eastern Misiones Province. It inhabits the interior and edges of a variety of wooded landscapes including montane, tropical evergreen, and temperate forest, at elevations up to 1,000 m.

strix chacoensis

(Strix chacoensis)

Chaco Owl

Сова болівійська

Body length: 35–38 cm.
Weight: 360–500 g.

It is found in southern South America, from Bolivia’s Santa Cruz Department south through western Paraguay into north-central Argentina. It inhabits the Gran Chaco, at elevations of 500–1,300 m.

strix rufipes

(Strix rufipes)

Rufous-legged Owl

Сова патагонська

Body length: 33–38 cm.
Weight: ≈350 g.

It is found in Chile from Valparaíso Province and in far western Argentina from Mendoza Province south to the tip of Tierra del Fuego. It primarily inhabits moist old-growth forests with a closed canopy and dense understory, at elevations up to 2,000 m.

strix uralensis

(Strix uralensis)

Ural Owl

Сова довгохвоста

Body length: 50–64 cm.
Wingspan: 110–134 cm.
Weight: 451–1,454 g.

The breeding range extends as far west as much of Scandinavia, montane eastern Europe, and, sporadically, central Europe, thence sweeping across the Palearctic broadly through Russia to as far east as Sakhalin and throughout Japan.

strix nebulosa

(Strix nebulosa)

Great Grey Owl

Сова бородата

Body length: 61–84 cm.
Weight: 580–1,900 g.

It breeds in North America, from as far east as Quebec to the Pacific coast and Alaska. In Eurasia, its breeding range extends north to 52°N latitude, from Scandinavia east to the Anadyr Basin and along the coasts of the Sea of Okhotsk and the Sea of Japan.

strix woodfordii

(Strix woodfordii)

African Wood Owl

Сова-лісовик африканська

Body length: 30.5–35 cm.
Weight: 240–350 g.

It is found throughout much of sub-Saharan Africa. Its range extends from Senegal and The Gambia eastward to Ethiopia, and south to Angola, Botswana, and Zimbabwe. It is also inhabits in Mozambique and the Cape Province of South Africa.

strix virgata

(Strix virgata)

Mottled Owl

Сова-лісовик бура

Body length: 28–35 cm.

It is native to Central and South America. Its range extends from Mexico south to Argentina and Brazil, occurring at elevations up to 2,500 m. It inhabits a variety of wooded habitats and plantations, as well as open countryside with scattered trees.

strix albitarsis

(Strix albitarsis)

Rufous-banded Owl

Сова-лісовик руда

Body length: 30–35 cm.
Weight: 265–350 g.

It is found in the Andes, from northern Venezuela south to western and southern Bolivia. It inhabits humid evergreen montane forest and cloud forests with a dense understory, epiphytes, and mosses, at elevations of 1,700–3,700 m.

strix huhula

(Strix huhula)

Black-banded Owl

Сова-лісовик смугаста

Body length: 30–36 cm.

Its natural habitats are varied subtropical or tropical forests ranging from lowlands to areas of medium altitude, and it has been found in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, and Venezuela.

strix nigrolineata

(Strix nigrolineata)

Black-and-white Owl

Сова-лісовик строката

Body length: 35–40 cm.
Weight: 400–535 g.

Its range extends from central Mexico south to the north-western section of Peru and western Colombia. It is mostly found in gallery forests and rainforests, but also occurs in wet deciduous and mangrove forests, at elevations of 0–2400 m.

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