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The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged
owl Owls are birds from the order Strigiformes (), which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance, a large, broad head, binocular vision, binaural hearing, sharp talons, and feathers a ...
found throughout open landscapes of North and South America. Burrowing owls can be found in
grassland A grassland is an area where the vegetation is dominated by grasses ( Poaceae). However, sedge ( Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur na ...
s,
rangeland Rangelands are grasslands, shrublands, woodlands, wetlands, and deserts that are grazed by domestic livestock or wild animals. Types of rangelands include tallgrass and shortgrass prairies, desert grasslands and shrublands, woodlands, sava ...
s, agricultural areas, deserts, or any other open, dry area with low vegetation. They nest and roost in burrows, such as those excavated by prairie dogs (''Cynomys'' spp.). Unlike most owls, burrowing owls are often active during the day, although they tend to avoid the midday heat. Like many other kinds of owls, though, burrowing owls do most of their hunting during dusk and dawn, when they can use their night vision and hearing to their advantage. Living in open grasslands as opposed to forests, the burrowing owl has developed longer legs that enable it to sprint, as well as fly, when hunting.


Taxonomy

The burrowing owl was formally described by Spanish naturalist
Juan Ignacio Molina Fr. Juan Ignacio Molina (; (June 24, 1740 – September 12, 1829) was a Chilean Jesuit priest, naturalist, historian, translator, geographer, botanist, ornithologist, and linguist. He is usually referred to as Abate Molina (a form of Abbot Moli ...
in 1782 under the binomial name ''Strix cunicularia'' from a specimen collected in Chile. The specific epithet is from the Latin ''cunicularius'' meaning "burrower" or "miner". The burrowing owl is now placed in the genus ''
Athene Athena or Athene, often given the epithet Pallas, is an ancient Greek goddess associated with wisdom, warfare, and handicraft who was later syncretized with the Roman goddess Minerva. Athena was regarded as the patron and protectress of va ...
'' that was introduced by German zoologist
Friedrich Boie Friedrich Boie (4 June 1789 – 3 March 1870) was a German entomologist, herpetologist, ornithologist, and lawyer.Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins Universit ...
in 1822. The burrowing owl is sometimes classified in the
monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...
''Speotyto'' based on an overall different
morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines * Morphology (archaeology), study of the shapes or forms of artifacts * Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies ...
and karyotype. Osteology and DNA sequence data, though, suggest that the burrowing owl is a
terrestrial Terrestrial refers to things related to land or the planet Earth. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to ...
member of the little owls (''Athene''), and it is today placed in that genus by most authorities. A considerable number of subspecies have been described, but they differ little in appearance and the
taxonomy Taxonomy is the practice and science of categorization or classification. A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...
of several of them needs to be validated. Most subspecies are found in/near the
Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...
and in the
Antilles The Antilles (; gcf, label=Antillean Creole, Antiy; es, Antillas; french: Antilles; nl, Antillen; ht, Antiy; pap, Antias; Jamaican Patois: ''Antiliiz'') is an archipelago bordered by the Caribbean Sea to the south and west, the Gulf of Mex ...
. Although distinct from each other, the relationship of the Florida subspecies to (and its distinctness from) the Caribbean birds is not quite clear. The 18 recognised subspecies, of which two are now extinct, are: *†''A. c. amaura'' (
Lawrence Lawrence may refer to: Education Colleges and universities * Lawrence Technological University, a university in Southfield, Michigan, United States * Lawrence University, a liberal arts university in Appleton, Wisconsin, United States Preparator ...
, 1878)
: Antiguan burrowing owl – formerly Antigua,
Saint Kitts Saint Kitts, officially the Saint Christopher Island, is an island in the West Indies. The west side of the island borders the Caribbean Sea, and the eastern coast faces the Atlantic Ocean. Saint Kitts and the neighbouring island of Nevis cons ...
, and
Nevis Nevis is a small island in the Caribbean Sea that forms part of the inner arc of the Leeward Islands chain of the West Indies. Nevis and the neighbouring island of Saint Kitts constitute one country: the Federation of Saint Kitts and ...
Islands, extinct (''circa'' 1905) * ''A. c. boliviana'' (L. Kelso, 1939): Bolivian burrowing owl – the Bolivian altiplano * ''A. c. brachyptera'' (
Richmond Richmond most often refers to: * Richmond, Virginia, the capital of Virginia, United States * Richmond, London, a part of London * Richmond, North Yorkshire, a town in England * Richmond, British Columbia, a city in Canada * Richmond, California, ...
, 1896)
: Margarita Island burrowing owl –
Margarita Island Margarita Island (, ) is the largest island in the States of Venezuela, Venezuelan state of Nueva Esparta, situated off the northeastern coast of the country, in the Caribbean Sea. The capital city of Nueva Esparta, La Asunción, is located on t ...
, might include ''A. c.apurensis'' * ''A. c. carrikeri'' (Stone, 1922): east Colombian burrowing owl – eastern Colombia, doubtfully distinct from ''A. c. tolimae'' * ''A. c. cunicularia'' ( Molina, 1782):- southern burrowing owl – lowlands of southern Bolivia and southern Brazil south to Tierra del Fuego, probably * '' A. c. floridana'' ( Ridgway, 1874): Florida burrowing owl – Florida and the Bahamas; listed as ''Vulnerable'' * ''A. c. grallaria'' (
Temminck Coenraad Jacob Temminck (; 31 March 1778 – 30 January 1858) was a Dutch aristocrat, zoologist and museum director. Biography Coenraad Jacob Temminck was born on 31 March 1778 in Amsterdam in the Dutch Republic. From his father, Jacob Temmin ...
, 1822)
: Brazilian burrowing owl – central and eastern Brazil *†''A. c. guadeloupensis'' (Ridgway, 1874): Guadeloupe burrowing owl – formerly Guadeloupe and
Marie-Galante Marie-Galante ( gcf, label=Antillean Creole, Mawigalant) is one of the islands that form Guadeloupe, an overseas department of France. Marie-Galante has a land area of . It had 11,528 inhabitants at the start of 2013, but by the start of 2018 ...
Islands, extinct (''circa'' 1890) * ''A. c. guantanamensis'' (Garrido, 2001): Cuban burrowing owl – Cuba and Isla de la Juventud * ''A. c. hypugaea'' ( Bonaparte, 1825): western burrowing owl – southern Canada through the Great Plains south to Central America; listed as ''Apparently Secure'' * ''A. c. juninensis'' (Berlepsch & Stolzmann, 1902): south Andean burrowing owl – Andes from central Peru to northwestern Argentina, might include ''A. c. punensis''. * ''A. c. minor'' (Cory, 1918): Guyanese burrowing owl – southern Guyana and Roraima region * ''A. c. nanodes'' ( Berlepsch & Stolzmann, 1892): southwest Peruvian burrowing owl – southwestern Peru, might include ''A. c. intermedia'' * ''A. c. pichinchae'' ( Boetticher, 1929): west Ecuadorean burrowing owl – western Ecuador * ''A. c. rostrata'' ( C. H. Townsend, 1890): Revillagigedo burrowing owl –
Clarion Island Isla Clarión, formerly called Santa Rosa, is the second largest, westernmost and most remote of Mexico's Revillagigedo Islands. The island is located west of Socorro Island and over from the Mexican mainland. It has an area of and three pr ...
,
Revillagigedo Islands The Revillagigedo Islands ( es, Islas Revillagigedo, ) or Revillagigedo Archipelago are a group of four volcanic islands in the Pacific Ocean, known for their unique ecosystem. They lie approximately from Socorro Island south and southwest of C ...
* ''A. c. tolimae'' (Stone, 1899): west Colombian burrowing owl – western Colombia, might include ''A. c. carrikeri'' * ''A. c. troglodytes'' ( Wetmore & Swales, 1931): Hispaniolan burrowing owl – Hispaniola ( Haiti and the
Dominican Republic The Dominican Republic ( ; es, República Dominicana, ) is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean region. It occupies the eastern five-eighths of the island, which it shares with ...
) and surrouding islands (
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 ...
,
Beata Island Beata Island ( es, Isla Beata) is a small island on the Caribbean Sea, located southwest from Cape Beata. Some southwest of it lies the smaller Alto Velo Island. It is politically part of the Dominican Republic, and is roughly triangle-shaped a ...
) includes ''A. c. partridgei'' (Olrog, 1976): Corrientes burrowing owl –
Corrientes Province Corrientes (, ‘currents’ or ‘streams’; gn, Taragui), officially the Province of Corrientes ( es, Provincia de Corrientes; gn, Taragüí Tetãmini) is a province in northeast Argentina, in the Mesopotamia region. It is surrounded by (fr ...
, Argentina, probably not distinct from ''A. c. cunicularia'' A
paleosubspecies A chronospecies is a species derived from a sequential development pattern that involves continual and uniform changes from an extinct ancestral form on an evolutionary scale. The sequence of alterations eventually produces a population that is p ...
, ''A. c. providentiae'', has been described from fossil remains from the
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in ...
of the Bahamas. How these birds relate to the extant ''A. c. floridana'' – that is, whether they were among the ancestors of that subspecies, or whether they represented a more distant lineage that completely disappeared later – is unknown. In addition, prehistoric fossils of similar owls have been recovered from many islands in the Caribbean (
Barbuda Barbuda (), is an island located in the eastern Caribbean forming part of the sovereign state of Antigua and Barbuda. It is located north of the island of Antigua and is part of the Leeward Islands of the West Indies. The island is a popula ...
, the Cayman Islands, Jamaica,
Mona Island Mona ( es, Isla de Mona) is the third-largest island of the Puerto Rican archipelago, after the main island of Puerto Rico and Vieques. It is the largest of three islands in the Mona Passage, a strait between the Dominican Republic and Puerto R ...
and
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and unincorporated ...
). These birds became extinct towards the end of the Pleistocene, probably because of ecological and sea-level changes at the end of the last ice age rather than human activity. These fossil owls differed in size from present-day burrowing owls and their relationship to the modern
taxon In biology, a taxon ( back-formation from '' taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular n ...
has not been resolved. Western burrowing owl, Glenn County-0550.jpg, Western burrowing owl (''A. c. hypugaea'')
California (U.S.) Burrowing Owl Florida.jpg, Florida burrowing owl (''A. c. floridana'')
Florida (U.S.) Athene cunicularia2.jpg, Brazilian burrowing owl (''A. c. grallaria'')
Jaú Jaú is a municipality in the center of the state of São Paulo, in Brazil. The population is 151,881 (2020 est.) in an area of . The elevation is . The city takes its name from the native fish species '' jau''. History The history of the city ...
(
São Paulo São Paulo (, ; Portuguese for ' Saint Paul') is the most populous city in Brazil, and is the capital of the state of São Paulo, the most populous and wealthiest Brazilian state, located in the country's Southeast Region. Listed by the Ga ...
, Brazil) LECHUCITA DE CAMPO Athene cunicularia.jpg, Southern burrowing owl (''A. c. cunicularia'')
Uruguay


Description

Burrowing owls have bright eyes; their beaks can be dark yellow or gray depending on the subspecies. They lack ear tufts and have a flattened
facial disc In ornithology, the facial disc is the concave collection of feathers on the face of some birds—most notably owls—surrounding the eyes. The concavity of the facial disc forms a circular paraboloid that collects sound waves and directs those ...
. The owls have prominent white
eyebrows An eyebrow is an area of short hairs above each Human eye, eye that follows the shape of the lower margin of the Supraorbital ridge, brow ridges of some mammals. In humans, eyebrows serve two main functions: first, human communication, communica ...
and a white "chin" patch which they expand and display during certain
behaviors Behavior (American English) or behaviour (British English) is the range of actions and mannerisms made by individuals, organisms, systems or artificial entities in some environment. These systems can include other systems or organisms as wel ...
, such as a bobbing of the head when agitated. Adults have brown heads and wings with white spotting. Their chests and abdomens are white with variable brown spotting or barring, also depending on the subspecies. Juvenile owls are similar in appearance, but they lack most of the white spotting above and brown barring below. The juveniles have a buff bar across their upper wings and their breasts may be buff-colored rather than white. Burrowing owls of all ages have grayish legs longer than those of other owls. Males and females are similar in size and appearance, so display little sexual dimorphism. Females tend to be heavier, but males tend to have longer linear measurements (wing length, tail length, etc.). Adult males appear lighter in color than females because they spend more time outside the burrow during daylight, and their feathers become "sun-bleached". The burrowing owl measures long and spans across the wings, and weighs . As a size comparison, an average adult is slightly larger than an American robin (''Turdus migratorius''). Burrowing owl (Athene cunicularia).jpg, Wild burrowing owl near Santa Fe, New Mexico Athene-cunicularia-burrowing-owl-0b.jpg, Immature Burrowing Owl 4354.jpg, ''A. c. floridana'', adult, Pembroke Pines, Florida Athene cunicularia 20110524 02.jpg, Five southern burrowing owls


Distribution and habitat

Before European colonization, burrowing owls probably inhabited every suitable area of the
New World The term ''New World'' is often used to mean the majority of Earth's Western Hemisphere, specifically the Americas."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: Oxford University Press, p. ...
, but in North America, they have experienced some restrictions in distribution since then. In parts of South America, they are expanding their range due to deforestation. The western burrowing owls (''A. c. hypugaea'') are most common in the
Rocky Mountain Arsenal National Wildlife Refuge The Rocky Mountain Arsenal National Wildlife Refuge is a National Wildlife Refuge located adjacent to Denver and Commerce City, Colorado, in the United States. It is approximately northeast of downtown Denver. The refuge is on the grounds of t ...
, as well as in most of the western states. Known resident populations inhabit areas of Colorado, Arizona, New Mexico, Texas and California, where their population is reportedly threatened by human encroachment and construction. Burrowing owls range from the southern portions of the western Canadian provinces (British Columbia, Alberta, Saskatchewan, Manitoba) and all the way through Mexico to western Panamá. They are also found across the state of Florida, as well as some Caribbean islands. In South America, they are fairly common, and are known to inhabit every country on the continent, with the exception of the dense Amazon rainforest interior and the highest ranges of the Andes Mountains. Their preference is for the cooler, possibly sub-tropical coastal and temperate regions. South of the Amazon, their population seems to again rebound, as they are widely distributed from southern Brazil and the
Pantanal The Pantanal () is a natural region encompassing the world's largest tropical wetland area, and the world's largest flooded grasslands. It is located mostly within the Brazilian state of Mato Grosso do Sul, but it extends into Mato Grosso and ...
down to
Patagonia Patagonia () refers to a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and g ...
and
Tierra del Fuego Tierra del Fuego (, ; Spanish for "Land of the Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla ...
. Burrowing owls are year-round residents in most of their range. Birds that breed in Canada and the northern U.S. usually migrate south to Mexico and the southern U.S. during winter months.


Behaviour and ecology

This species can live for at least 9 years in the wild and over 10 years in captivity. They are often killed by vehicles when crossing roads, and have many natural enemies, including
badgers Badgers are short-legged omnivores in the family Mustelidae (which also includes the otters, wolverines, martens, minks, polecats, weasels, and ferrets). Badgers are a polyphyletic rather than a natural taxonomic grouping, being united by the ...
, coyotes, and snakes. They are also killed by both
feral A feral () animal or plant is one that lives in the wild but is descended from domesticated individuals. As with an introduced species, the introduction of feral animals or plants to non-native regions may disrupt ecosystems and has, in some ...
and
domestic Domestic may refer to: In the home * Anything relating to the human home or family ** A domestic animal, one that has undergone domestication ** A domestic appliance, or home appliance ** A domestic partnership ** Domestic science, sometimes c ...
cats and dogs. Two birds studied in the Parque Nacional de La Macarena of Colombia were free of blood parasites. Burrowing owls often nest and roost in the burrows made by ground squirrels, a strategy also used by rattlesnakes. When threatened, the owl retreats to the burrow and produces rattling and hissing sounds similar to those of a rattlesnake. The behavior is suggested to be an example of acoustic Batesian mimicry and has been observed to be an effective strategy against animals that are familiar with the dangers posed by rattlesnakes.


Breeding

The nesting season begins in late March or April in North America. Burrowing owls usually only have one mate but occasionally a male will have two mates. Pairs of owls will sometimes nest in loose colonies. Their typical breeding habitat is open grassland or prairie, but they can occasionally adapt to other open areas like airports, golf courses, and agricultural fields. Burrowing owls are slightly tolerant of human presence, often nesting near roads, farms, homes, and regularly maintained irrigation canals. The owls nest in a burrow, hence the name burrowing owl. If burrows are unavailable and the soil is not hard or rocky, the owls may excavate their own. Burrowing owls will also nest in shallow, underground, man-made structures that have easy access to the surface. During the nesting season, burrowing owls will collect a wide variety of materials to line their nest, some of which are left around the entrance to the burrow. The most common material is mammal dung, usually from cattle. At one time it was thought that the dung helped to mask the scent of the juvenile owls, but researchers now believe the dung helps to control the microclimate inside the burrow and to attract insects, which the owls may eat. The female lays an egg every one or two days until she has completed a clutch, which can consist of four to 12 eggs (usually 9). She then incubates the eggs for 3–4 weeks while the male brings her food. After the eggs hatch, both parents feed the chicks. Four weeks after hatching, the chicks can make short flights and begin leaving the nest burrow. The parents still help feed the chicks for 1–3 months. Site fidelity rates appear to vary among populations. In some locations, owls will frequently reuse a nest several years in a row. Owls in migratory northern populations are less likely to return to the same burrow every year. Also, as with many other birds, the female owls are more likely to disperse to a different site than are male owls.


Food and feeding

When hunting, they wait on a perch until they spot prey. Then, they swoop down on prey or fly up to catch insects in flight. Sometimes, they chase prey on foot across the ground. The highly variable diet includes
invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...
s and small
vertebrate Vertebrates () comprise all animal taxa within the subphylum Vertebrata () (chordates with backbones), including all mammals, birds, reptiles, amphibians, and fish. Vertebrates represent the overwhelming majority of the phylum Chordata, with c ...
s, which make up roughly one third and two thirds of the diet, respectively. Burrowing owls mainly eat large insects and small rodents. Although burrowing owls often live close to
ground squirrel Ground squirrels are members of the squirrel family of rodents ( Sciuridae), which generally live on or in the ground, rather than trees. The term is most often used for the medium-sized ground squirrels, as the larger ones are more commonly known ...
s (Marmotini), they rarely prey upon them. They also hunt bats. An analysis of burrowing owl diets in the Dominican Republic found the owls consumed ~53% invertebrates, ~28% other birds, ~15% reptiles, ~3% amphibians, and 1% mammals. Rodent prey is usually dominated by locally superabundant species, like the delicate vesper mouse (''Calomys tener'') in southern Brazil. Among squamates and amphibians, small lizards like the
tropical house gecko The tropical house gecko, Afro-American house gecko or cosmopolitan house gecko (''Hemidactylus mabouia'') is a species of house gecko native to sub-Saharan Africa. It is also currently found in North, Central and South America and the Caribbean ...
(''Hemidactylus mabouia''), snakes, and frogs and toads predominate. Generally, most vertebrate prey is in the weight class of several grams per individual. The largest prey are usually birds, such as
eared dove The eared dove (''Zenaida auriculata'') is a New World dove. It is a resident breeder throughout South America from Colombia to southern Argentina and Chile, and on the offshore islands from the Grenadines southwards. It may be a relatively re ...
s (''Zenaida auriculata'') which may weigh almost as much as a burrowing owl, as well as sparrows.https://sta.uwi.edu/fst/lifesciences/sites/default/files/lifesciences/images/Athene%20cunicularia%20-%20Burrowing%20Owl.pdf Regarding invertebrates, the burrowing owl seems less of a
generalist A generalist is a person with a wide array of knowledge on a variety of subjects, useful or not. It may also refer to: Occupations * a physician who provides general health care, as opposed to a medical specialist; see also: ** General pract ...
. It is extremely fond of termites such as Termitidae, and Orthoptera such as Conocephalinae and Copiphorinae katydids,
Jerusalem cricket Jerusalem crickets (or potato bugs) are a group of large, flightless insects in the genera ''Ammopelmatus'' and ''Stenopelmatus'', together comprising the tribe Stenopelmatini. The former genus is native to the western United States and parts ...
s (Stenopelmatidae), true crickets (Gryllidae) and grasshoppers. ''Bothynus'' and ''Dichotomius anaglypticus''
scarab beetle The family Scarabaeidae, as currently defined, consists of over 30,000 species of beetles worldwide; they are often called scarabs or scarab beetles. The classification of this family has undergone significant change in recent years. Several sub ...
s (Scarabaeidae) were eaten far more often than even closely related species by many burrowing owls across central
São Paulo São Paulo (, ; Portuguese for ' Saint Paul') is the most populous city in Brazil, and is the capital of the state of São Paulo, the most populous and wealthiest Brazilian state, located in the country's Southeast Region. Listed by the Ga ...
(Brazil). Similarly, it was noted that among scorpions Bothriuridae were much preferred, among spiders Lycosidae (
wolf spider Wolf spiders are members of the family Lycosidae (). They are robust and agile hunters with excellent eyesight. They live mostly in solitude, hunt alone, and do not spin webs. Some are opportunistic hunters, pouncing upon prey as they find it or ...
s), and among
millipede Millipedes are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature. Each double-legged segment is a resu ...
s (Diplopoda) certain Diplocheta. Small
ground beetle Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it is one of the 10 most species-rich animal f ...
s (Carabidae) are eaten in quantity, while larger ones are much less popular as burrowing owl food, perhaps due to the vigorous defense the large species can put up.
Earthworm An earthworm is a terrestrial invertebrate that belongs to the phylum Annelida. They exhibit a tube-within-a-tube body plan; they are externally segmented with corresponding internal segmentation; and they usually have setae on all segments. T ...
s are also preyed upon. Burrowing owls are also known to place the fecal matter of large herbivorous mammals around the outside of their burrows to attract dung beetles, which are used to provide a steady source of food for the owls. Burrowing owls can also predate on invertebrates attracted to artificial night lighting. Unlike other owls, they also eat fruits and seeds, especially the fruit of tasajillo ('' Cylindropuntia leptocaulis'') and other prickly pear and cholla cacti. On
Clarion Island Isla Clarión, formerly called Santa Rosa, is the second largest, westernmost and most remote of Mexico's Revillagigedo Islands. The island is located west of Socorro Island and over from the Mexican mainland. It has an area of and three pr ...
, where mammalian prey is lacking, they feed essentially on
cricket Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by str ...
s and prickly pear fruit, adding
Clarión wren The Clarión wren (''Troglodytes tanneri'') is a species of bird in the family Troglodytidae. It is endemic to Clarión Island off Pacific Mexico. It looks much like a house wren but is larger with a prominently longer bill, somewhat approachi ...
s (''Troglodytes tanneri'') and young Clarion
mourning dove The mourning dove (''Zenaida macroura'') is a member of the dove family, Columbidae. The bird is also known as the American mourning dove, the rain dove, and colloquially as the turtle dove, and was once known as the Carolina pigeon and Caroli ...
s (''Zenaida macroura clarionensis'') on occasion.


Status and conservation

The burrowing owl is
endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and in ...
in Canada and
threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensa ...
in Mexico. It is a state threatened species in Colorado and Florida and a California species of special concern. It is common and widespread in open regions of many
Neotropical The Neotropical realm is one of the eight biogeographic realms constituting Earth's land surface. Physically, it includes the tropical terrestrial ecoregions of the Americas and the entire South American temperate zone. Definition In bioge ...
countries, where they sometimes even inhabit fields and parks in cities. In regions bordering the Amazon Rainforest they are spreading with
deforestation Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated ...
. It is therefore listed as
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 ...
on the
IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...
. Burrowing owls are protected under the
Migratory Bird Treaty Act The Migratory Bird Treaty Act of 1918 (MBTA), codified at (although §709 is omitted), is a United States federal law, first enacted in 1918 to implement the convention for the protection of migratory birds between the United States and Canada . ...
in Canada, the United States, and Mexico. They are also included in
CITES CITES (shorter name for the Convention on International Trade in Endangered Species of Wild Fauna and Flora, also known as the Washington Convention) is a multilateral treaty to protect endangered plants and animals from the threats of interna ...
Appendix II CITES (shorter name for the Convention on International Trade in Endangered Species of Wild Fauna and Flora, also known as the Washington Convention) is a multilateral treaty to protect endangered plants and animals from the threats of interna ...
.
NatureServe NatureServe, Inc. is a non-profit organization based in Arlington County, Virginia, US, that provides proprietary wildlife conservation-related data, tools, and services to private and government clients, partner organizations, and the public. Nat ...
lists the species as ''Apparently Secure''.


Dependency on burrowing animals

The major reasons for declining populations in North America are loss of habitat, and control programs for prairie dogs. While some species of burrowing owl can dig their own burrows, most species rely on burrowing animals to burrow holes that the owls can use as shelter and nesting space. There is a high correlation between the location of burrowing animal colonies, like those of ground squirrels, with the presence of burrowing owls. Rates of burrowing owl decline have also been shown to correlate with prairie dog decline. Western burrowing owls, for example, nest in burrows made by black-tailed prairie dogs since they are unable to dig their own. However, prairie dog populations have experienced a decline, one of the causes of this being prairie dog eradication programs. When prairie dogs dig burrows, they can uproot plants in the process.Montana Department of Agriculture. 2019. “PRAIRIE  DOG  MANAGEMENT,” 11. This is most common in agricultural areas, where burrows cause damage to existing crops, creating a problem for local farmers. In Nebraska and Montana, eradication programs have already been put in place to manage the population of prairie dogs. Eradication programs for ground squirrels have also been put in place. In California, California ground squirrels have been known to feed on crop seedlings as well as grasses meant for cattle, which prevents crop growth and decreases food supply for cattle. However, as burrowing animal populations decrease, burrowing owls become more vulnerable to exposure to predators. With fewer burrows available, burrowing owl populations will be more concentrated, with more owls occupying fewer burrows . As a result, predators will more easily detect owl populations and be capable of eliminating larger broods of owls at once. Prairie dogs and ground squirrels also act as a buffer between owls and their predators, since they become the target prey rather than the owls. Another benefit prairie dogs in particular provide burrowing owls takes the form of their alarm calls, which alert burrowing owls if predators are nearby, therefore giving the owls ample time to hide or escape. Without burrowing animals, almost every aspect contributing to suitable and safe living for burrowing owls will no longer be available. Organizations have tried contributing to the conservation of burrowing owls by digging artificial burrows for these owls to occupy in areas with no active colony of burrowing animals.Pert, Heather and Shannon Lucas. 2016. "Burrowing owls dispersal and natural habitat expansion in Western Riverside County”. California Department of Fish and Wildlife. However, creating artificial burrows is not sustainable and is not effective as a long term solution.


Anthropogenic impacts

Burrowing owls readily inhabit some anthropogenic landscapes, such as airport grasslands or
golf course A golf course is the grounds on which the sport of golf is played. It consists of a series of holes, each consisting of a tee box, a fairway, the rough and other hazards, and a green with a cylindrical hole in the ground, known as a "cup". ...
s, and are known to take advantage of artificial nest sites (plastic burrows with tubing for the entrance) and perches. Burrowing owls have demonstrated similar reproductive success in rural grasslands and urban settings. The urban-residing burrowing owls have also developed the behavior of digging their own burrows and exhibit different fear responses to human and domestic dogs compared to their rural counterparts. Research has suggested that this species has made adaptations to the rapid urbanization of their usual habitat, and conservation efforts should be considered accordingly. Genetic analysis of the two North American subspecies indicates that
inbreeding Inbreeding is the production of offspring from the mating or breeding of individuals or organisms that are closely related genetically. By analogy, the term is used in human reproduction, but more commonly refers to the genetic disorders and o ...
is not a problem within those populations.


Relocation

Where the presence of burrowing owls conflicts with development interests, a passive relocation technique has been applied successfully: rather than capturing the birds and transporting them to a new site (which may be stressful and prone to failure), the owls are half-coerced, half-enticed to move on their own accord. The preparations need to start several months prior to the anticipated disturbance with observing the owl colony and noting especially their local movements and site preferences. After choosing a location nearby that has suitable ground and provides good burrowing owl breeding habitat, this new site is enhanced by adding burrows, perches, etc. Once the owls have accustomed to the changes and are found to be interested in the location – if possible, this should be at the onset of spring, before the breeding season starts – they are prevented from entering the old burrows. A simple one-way
trapdoor A trapdoor is a sliding or hinged door in a floor or ceiling. It is traditionally small in size. It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. The trapdoor has played a pivot ...
design has been described that is placed over the burrow for this purpose. If everything has been correctly prepared, the owl colony will move over to the new site in the course of a few nights at most. It will need to be monitored occasionally for the following months or until the major human construction nearby has ended.


References


Further reading

* * * *


External links


Burrowing Owl Live Camera Feed & Fact Sheet
at critterzoom.com *

* ttp://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Burrowing_Owl.html Burrowing Owl Species Account– Cornell Lab of Ornithology *
Burrowing Owl Conservation Network


at The Ark in Space * {{authority control
burrowing owl The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged owl found throughout open landscapes of North and South America. Burrowing owls can be found in grasslands, rangelands, agricultural areas, deserts, or an ...
burrowing owl The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged owl found throughout open landscapes of North and South America. Burrowing owls can be found in grasslands, rangelands, agricultural areas, deserts, or an ...
Birds of the Dominican Republic Fauna of the Sonoran Desert Native birds of the Canadian Prairies Native birds of the Southeastern United States Native birds of the Western United States Tool-using animals Subterranean nesting birds
burrowing owl The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged owl found throughout open landscapes of North and South America. Burrowing owls can be found in grasslands, rangelands, agricultural areas, deserts, or an ...
burrowing owl The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged owl found throughout open landscapes of North and South America. Burrowing owls can be found in grasslands, rangelands, agricultural areas, deserts, or an ...