The stygian owl (''Asio stygius'') is a medium-sized "

typical owl The true owls or typical owls (family Strigidae) are one of the two generally accepted families of owls, the other being the barn owls (Tytonidae). This large family comprises 230 living or recently extinct species in 24 genera. The typical owl ...

" in subfamily Striginae. It is found in

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

, parts of

Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...

Cuba Cuba ( , ), officially the Republic of Cuba ( es, República de Cuba, links=no ), is an island country comprising the island of Cuba, as well as Isla de la Juventud and several minor archipelagos. Cuba is located where the northern Caribbea ...

Hispaniola Hispaniola (, also ; es, La Española; Latin and french: Hispaniola; ht, Ispayola; tnq, Ayiti or Quisqueya) is an island in the Caribbean that is part of the Greater Antilles. Hispaniola is the most populous island in the West Indies, and th ...

, and 10 countries in

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

.HBW and BirdLife International (2020) ''Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world'' Version 5. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v5_Dec20.zip xls zipped 1 MBretrieved 27 May 2021Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 31 January 2022. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved February 1, 2022

Taxonomy and systematics

The stygian owl has these six recognized subspecies: *''A. s. lambi'' Moore, RT (1937) *''A. s. robustus'' Kelso, L (1934) *''A. s. siguapa''

d'Orbigny Alcide Charles Victor Marie Dessalines d'Orbigny (6 September 1802 – 30 June 1857) was a French naturalist who made major contributions in many areas, including zoology (including malacology), palaeontology, geology, archaeology and anthrop ...

(1839) *''A. s. noctipetens'' Riley (1916) *''A. s. stygius'' Wagler (1832) *''A. s. barberoi'' Bertoni, AW (1930)

Description

The stygian owl is long and weighs about . The sexes have similar very dark plumage. (The adjective "stygian" means "of, or relating to, the River

Styx In Greek mythology, Styx (; grc, Στύξ ) is a river that forms the boundary between Earth (Gaia) and the Underworld. The rivers Acheron, Cocytus, Lethe, Phlegethon, and Styx all converge at the centre of the underworld on a great marsh, whic ...

", but is more widely applied to anything that is dark or dismal.) The face is blackish with a pale border and a whitish forehead, and the head has long dark feathers that project upward as "ears". The dark upperparts have buff streaks and bars; the underparts are a dingy buff with dark brown or blackish barring and streaks. The eye is shades of yellow, the bill blue-black to blackish, and the feet dark grayish or brownish pink. The subspecies are substantially alike, differing mostly in the shade of the upperparts' streaks and somewhat in size.Arizmendi, M. d. C., C. I. Rodríguez-Flores, C. A. Soberanes-González, and T. S. Schulenberg (2020). Stygian Owl (''Asio stygius''), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.styowl1.01 retrieved March 8, 2022

Distribution and habitat

The subspecies of stygian owl are found thus (but see the text below the list): *''A. s. lambi'', northwestern Mexico from

Sonora Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. The state is d ...

and Chihuahua south to

Jalisco Jalisco (, , ; Nahuatl: Xalixco), officially the Free and Sovereign State of Jalisco ( es, Estado Libre y Soberano de Jalisco ; Nahuatl: Tlahtohcayotl Xalixco), is one of the 31 states which, along with Mexico City, comprise the 32 Federal En ...

*''A. s. robustus'', discontinuously from

Guerrero Guerrero is one of the 32 states that comprise the 32 Federal Entities of Mexico. It is divided in 81 municipalities and its capital city is Chilpancingo and its largest city is Acapulcocopied from article, GuerreroAs of 2020, Guerrero the pop ...

and

Veracruz Veracruz (), formally Veracruz de Ignacio de la Llave (), officially the Free and Sovereign State of Veracruz de Ignacio de la Llave ( es, Estado Libre y Soberano de Veracruz de Ignacio de la Llave), is one of the 31 states which, along with Me ...

in Mexico south into northern Nicaragua *''A. s. siguapa'', mainland Cuba and

Isla de la Juventud Isla de la Juventud (; en, Isle of Youth) is the second-largest Cuban island (after Cuba's mainland) and the seventh-largest island in the West Indies (after mainland Cuba itself, Hispaniola, Jamaica, Puerto Rico, Trinidad, and Andros Islan ...

(Isle of Pines) *''A. s. noctipetens'', mainland Hispaniola and

Gonâve Island Gonâve Island or Zile Lagonav (french: Île de la Gonâve, ; also ''La Gonâve'') is an island of Haiti located west-northwest of Port-au-Prince in the Gulf of Gonâve. It is the largest of the Hispaniolan satellite islands. The island is an a ...

*''A. s. stygius'', Colombia and Venezuela south to Bolivia and discontinuously in central and southern Brazil *''A. s. barberoi'', Paraguay and northern Argentina In addition, the stygian owl has been documented as a vagrant in

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...

, and

Trinidad Trinidad is the larger and more populous of the two major islands of Trinidad and Tobago. The island lies off the northeastern coast of Venezuela and sits on the continental shelf of South America. It is often referred to as the southernmos ...

. Some authors merge ''A. s. lambi'' into ''A. s. robustus''. Some extend the range of ''robustus'' to include the Colombian, Ecuadorian, and Venezuelan populations otherwise attributed to ''A. s. stygius''. Some include ''A. s. noctipetens'' in ''A. s. siguapa''. And some include the population in southeastern Brazil in ''A. s. barberoi'' instead of in ''A. s. stygius''. The stygian owl inhabits a wide variety of landscapes from sea level to of elevation. Most are fairly open rather than densely forested or purely grasslands. They include montane pine, pine-oak, and

cloud forest A cloud forest, also called a water forest, primas forest, or tropical montane cloud forest (TMCF), is a generally tropical or subtropical, evergreen, montane, moist forest characterized by a persistent, frequent or seasonal low-level cloud c ...

s, thorn scrub,

cerrado The ''Cerrado'' (, ) is a vast ecoregion of tropical savanna in eastern Brazil, particularly in the states of Goiás, Mato Grosso do Sul, Mato Grosso, Tocantins, Minas Gerais, and the Federal District. The core areas of the Cerrado biome are t ...

, pine plantations, and even urban parks.

Behavior

Movement

As far as is known, the stygian owl is resident throughout its range.

Feeding

The stygian owl is wholly nocturnal. The largest part of its diet is birds, from very small ones to some as large as the lesser nothura (''Nothura minor''); it is thought that most birds are caught on their nightime roosts. The diet also includes bats (which are seldom preyed on by other owls), some other mammals (like

Hispaniolan solenodon The Hispaniolan solenodon (''Solenodon paradoxus'') is a small, furry, shrew-like mammal endemic to the Caribbean island of Hispaniola (in the Dominican Republic and Haiti). Like other solenodons, it is a venomous, insect-eating animal that liv ...

sJonathan J. Derbridge et al., "Solenodon paradoxus (Soricomorpha: Solenodontidae)," Mammalian Species, Volume 47, Issue 927, 2015, Pages 100 - 106.), frogs, and insects. Also in contrast to other owls, rodents do not appear to be part of its diet.

Breeding

The stygian owl's breeding

phenology Phenology is the study of periodic events in biological life cycles and how these are influenced by seasonality, seasonal and interannual variations in climate, as well as environmental factor, habitat factors (such as elevation). Examples includ ...

is not well known. Its breeding seasons vary widely across its range. Males give a wing-clapping display in flight. It nests on the ground or in trees; in the latter it apparently reuses nests of other species. It lays two or three eggs.

Vocalization

The stygian owl's song has been variously described as "a single deep, emphatic ''woof'' or ''wupf''", "a very low and loud ''hu'' or ''hu-hu''", and "a muffled hoot given singly: ''boo''". Females also give "a short, screamed ''rre-ehhr'' or ''mehrr''" when calling to the male and also "a short catlike ''miah''".

Status

The

IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

has assessed the stygian owl as being of

Least Concern A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. T ...

. It has a very large range, but its population size is not known and is believed to be decreasing. No specific threats have been identified.

References

External links

Owling.comThe Owl Pages
{{Taxonbar, from=Q1263556

Stygian owl The stygian owl (''Asio stygius'') is a medium-sized "typical owl" in subfamily Striginae. It is found in Mexico, parts of Central America, Cuba, Hispaniola, and 10 countries in South America.HBW and BirdLife International (2020) ''Handbook of ...

Birds of Cuba Birds of Hispaniola Higher-level bird taxa restricted to the Neotropics