''Asio'' is a genus of
typical owls
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 ...
, or true owls, in the family
Strigidae
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 ...
. This group has representatives over most of the planet, and the
short-eared owl
The short-eared owl (''Asio flammeus'') is a widespread grassland species in the family Strigidae. Owls belonging to genus ''Asio'' are known as the eared owls, as they have tufts of feathers resembling mammalian ears. These "ear" tufts may or ...
is one of the most widespread of all bird species, breeding in
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...
,
Asia
Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...
,
North
North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating Direction (geometry), direction or geography.
Etymology
T ...
and
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 ...
, the
Caribbean
The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Se ...
,
Hawaii
Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...
and the
Galápagos Islands
The Galápagos Islands (Spanish: , , ) are an archipelago of volcanic islands. They are distributed on each side of the equator in the Pacific Ocean, surrounding the centre of the Western Hemisphere, and are part of the Republic of Ecuador ...
. Its geographic range extends to all continents except
Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest contine ...
and
Australia
Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
.
These are medium-sized owls, in length with wingspans. They are long-winged and have the characteristic facial disc. The two northern species are partially
migratory, moving south in winter from the northern parts of their range, or wandering nomadically in poor
vole
Voles are small rodents that are relatives of lemmings and hamsters, but with a stouter body; a longer, hairy tail; a slightly rounder head; smaller eyes and ears; and differently formed molars (high-crowned with angular cusps instead of low-c ...
years in search of better food supplies. Tropical ''Asio'' owls are largely sedentary. These owls hunt over open fields or grasslands, taking mainly
rodent
Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...
s, other small
mammal
Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or ...
s and some
bird
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...
s.
''Asio'' owls are mainly
nocturnal
Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite.
Nocturnal creatures generally have highly developed sens ...
, but short-eared owls are also
crepuscular
In zoology, a crepuscular animal is one that is active primarily during the twilight period, being matutinal, vespertine, or both. This is distinguished from diurnal and nocturnal behavior, where an animal is active during the hours of daylig ...
. Most species nest on the ground, but the long-eared owl (''
Asio otus
The long-eared owl (''Asio otus''), also known as the northern long-eared owlOlsen, P.D. & Marks, J.S. (2019). ''Northern Long-eared Owl (Asio otus)''. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook o ...
'')
nests
A nest is a structure built for certain animals to hold eggs or young. Although nests are most closely associated with birds, members of all classes of vertebrates and some invertebrates construct nests. They may be composed of organic materi ...
in the old stick nests of
crow
A crow is a bird of the genus '' Corvus'', or more broadly a synonym for all of ''Corvus''. Crows are generally black in colour. The word "crow" is used as part of the common name of many species. The related term "raven" is not pinned scientifica ...
s,
ravens and
magpie
Magpies are birds of the Corvidae family. Like other members of their family, they are widely considered to be intelligent creatures. The Eurasian magpie, for instance, is thought to rank among the world's most intelligent creatures, and is one ...
s (family
Corvidae
Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens, rooks, jackdaws, jays, magpies, treepies, choughs, and nutcrackers. In colloquial English, they are known as the crow family or corvids. Cu ...
) and various
hawk
Hawks are bird of prey, birds of prey of the family Accipitridae. They are widely distributed and are found on all continents except Antarctica.
* The subfamily Accipitrinae includes goshawks, sparrowhawks, sharp-shinned hawks and others. Th ...
s.
Taxonomy
The
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
''Asio'' was introduced by the French zoologist
Mathurin Jacques Brisson
Mathurin Jacques Brisson (; 30 April 1723 – 23 June 1806) was a French zoologist and natural philosopher.
Brisson was born at Fontenay-le-Comte. The earlier part of his life was spent in the pursuit of natural history; his published works ...
in 1760 with the
long-eared owl
The long-eared owl (''Asio otus''), also known as the northern long-eared owlOlsen, P.D. & Marks, J.S. (2019). ''Northern Long-eared Owl (Asio otus)''. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook o ...
(''Asio otus'') as the
type species
In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...
. The genus name is from ''asiō'', the
Latin
Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
name used by
Pliny the Younger
Gaius Plinius Caecilius Secundus, born Gaius Caecilius or Gaius Caecilius Cilo (61 – c. 113), better known as Pliny the Younger (), was a lawyer, author, and magistrate of Ancient Rome. Pliny's uncle, Pliny the Elder, helped raise and educate ...
for a type of horned owl, the feather tufts on the head of these owls give the appearance of "ears" which is a defining characteristic.
Species
The genus contains the following nine species:
*
Jamaican owl
The Jamaican owl (''Asio grammicus'') is a medium-sized owl that is endemic to the island of Jamaica.
Taxonomy and systematics
The Jamaican owl was previously considered the only member of the genus ''Pseudoscops'', but phylogenetic analysis ...
, ''Asio grammicus'' (formerly placed in ''Pseudoscops'')
*
Striped owl
The striped owl (''Asio clamator'') is a medium-sized owl with large ear tufts and a brownish-white facial disk rimmed with black. Its beak is black, and it has cinnamon-colored eyes. It has shorter, rounder wings than most of its close relative ...
, ''Asio clamator'' (formerly placed in ''Pseudoscops'' or ''Rhinoptynx'')
*
Long-eared owl
The long-eared owl (''Asio otus''), also known as the northern long-eared owlOlsen, P.D. & Marks, J.S. (2019). ''Northern Long-eared Owl (Asio otus)''. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook o ...
, ''Asio otus''
*
Abyssinian owl, ''Asio abyssinicus''
*
Madagascar owl
The Madagascar owl (''Asio madagascariensis''), also known as the Madagascan owl or Madagascar long-eared owl, is a medium-sized owl endemic to the island of Madagascar. It is sometimes considered to be conspecific with the long-eared owl (''Asio ...
, ''Asio madagascariensis''
*
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 ...
, ''Asio stygius''
*
Short-eared owl
The short-eared owl (''Asio flammeus'') is a widespread grassland species in the family Strigidae. Owls belonging to genus ''Asio'' are known as the eared owls, as they have tufts of feathers resembling mammalian ears. These "ear" tufts may or ...
, ''Asio flammeus''
*
Marsh owl
The marsh owl (''Asio capensis'') is a medium to large species of owl in the family Strigidae.
Description
Medium-sized, dark brown with a pumpkin-shaped head with small 'ear' tufts. The facial disc is pale buff, with a distinct dark brown ri ...
, ''Asio capensis''
*
Fearful owl
The fearful owl (''Asio solomonensis'') is a medium-sized owl endemic to the Solomon Islands archipelago. It is generally seen at elevations of up to 800 m above sea level, where it is found in tall lowland or hill forests.
Description
The fea ...
, ''Asio solomonensis''
Three
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
species are recognized:
* ''Asio brevipes'' (Glenns Ferry Late Pliocene of Hagerman, USA)
* ''Asio priscus'' (Late Pleistocene of San Miguel Island and Santa Rosa Island, USA)
* ''
Asio ecuadoriensis'' (Late Pleistocene of Ecuador)
[Lo Coco, G.E., Agnolín, F.L. & Román Carrión, J.L.]
Late Pleistocene owls (Aves, Strigiformes) from Ecuador, with the description of a new species
In: J Ornithol 161, pp 713–721; March 5, 2020; doi:10.1007/s10336-020-01756-x
The supposed Late Eocene/Early Oligocene eared owl ''"Asio" henrici'' has been recognized as a member of the fossil
barn-owl
Barn-owls (family Tytonidae) are one of the two families of owls, the other being the true owls or typical owls, Strigidae. They are medium to large owls with large heads and characteristic heart-shaped faces. They have long, strong legs with p ...
genus ''Selenornis''. ''"Asio" pygmaeus'' (often misspelt ''pigmaeus'') cannot be assigned to a genus without restudy of the material. ''"Asio" collongensis'' (Middle Miocene of Vieux-Collonges, France) is now placed in the genus ''Alasio''.
[Mlíkovský, Jirí (2002): ]
Cenozoic Birds of the World, Part 1: Europe
''. Ninox Press, Prague.
References
{{Taxonbar, from=Q648422
Bird genera