Aegolius harrisii

Life-forms

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Subsectio: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Cladus: Theropoda
Cladus: Neotheropoda
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Euornithes
Cladus: Ornithuromorpha
Cladus: Ornithurae
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Ordo: Strigiformes

Familia: Strigidae
Subfamilia: Surniinae
Genus: Aegolius
Species: Aegolius harrisii
Subspecies: A. h. dabbenei – A. h. harrisii – A. h. iheringi
Name

Aegolius harrisii (Cassin, 1849)
Synonyms

Nyctale harrisii (protonym)

References

Cassin, J. 1849. Description of new species of the genera Nyctale, Brehm., and Sycobius, Vieill.; specimens of which are in the collection of the Academy of Natural Sciences of Philadelphia. Proceedings of the Academy of Natural Sciences of Philadelphia 4(1848) p.157. BHL [The title page is dated 1848 but the volume was not published until the following year.]

Vernacular names
čeština: Sýc plavočelý
Deutsch: Gelbstirnkauz
English: Buff-fronted Owl
español: Mochuelo canela
magyar: Halványhomlokú bagoly
norsk: Svartbrynugle
português: Caburé-acanelado
svenska: Gulpannad pärluggla

The buff-fronted owl (Aegolius harrisii) is a small owl. It is found in widely separated areas in every South American country except French Guiana and Suriname.[2][3]

Taxonomy and systematics

The buff-fronted owl was described by the American ornithologist John Cassin in 1849, and given the binomial name Nyctale harrisii.[4][5] The binomial commemorates the American ornithologist Edward Harris.[6]

The buff-fronted owl is the only member of genus Aegolius in South America. Its closest relative is the northern saw-whet owl (A. acadicus) of Canada and the U.S., and the other two extant members of the genus are found there and in Mexico. It has three subspecies, the nominate A. h. harrisii, A. h. dabbenei, and A. h. iheringi. The last of these has been suggested to be a separate species.[3][2][7]
Description

The buff-fronted owl is 19 to 21 cm (7.5 to 8.3 in) long and weighs 104 to 155 g (3.7 to 5.5 oz). It is compact and has a short tail and a large blocky head without ear tufts. Its facial disks are buff with a black surround and distinctive black patches above its greenish yellow eyes. The nominate subspecies' forehead and hindneck are yellowish buff and the rest of the head and upperparts chocolate brown. The tail is blackish and has two white bars and a white tip. Its chin has a small brown patch and the rest of the underparts are yellowish buff. A. h. dabbenei has darker upperparts and a cinnamon tinge on the underparts. A. h. iheringi is also darker above and its underparts are a deeper orange.[7]
Distribution and habitat

The nominate subspecies of the buff-fronted owl is found discontinuously in the Andes from Venezuela south to southern Peru. A. h. iheringi is also found discontinuously, in Bolivia, Paraguay, eastern Brazil, and in southern Brazil, northeastern Argentina, and northeastern Paraguay. A. h. dabbenei is found in northwestern Argentina, and birds observed in western Bolivia might also be this subspecies. The subspecies of birds found locally on the tepuis of southern Venezuela and Guyana is not known.[2][7]

The buff-fronted owl inhabits a variety of landscapes including open humid forest, dry forest, forest edges, subtropical rainforest, and human-altered areas with fruit trees and palms. In the Andes in ranges between 1,500 and 3,800 m (4,900 and 12,500 ft) and elsewhere between about 600 and 1,000 m (2,000 and 3,300 ft).[7]

Behavior
Feeding

The buff-fronted owl's hunting behavior and diet have not been studied. It has been recorded taking insects, rodents, birds, and other small vertebrates.[7]
Breeding

Almost nothing is known about the buff-fronted owl's breeding phenology. A nest with three eggs was found in Brazil in March; it was in a dead palm, in what appeared to be an abandoned parrot nest cavity. Another nest was in a hollow tree.[7]
Vocalization

Dickcissel male perched on a metal pole singing, with neck stretched and beak open.

Songs and calls
Listen to buff-fronted owl on xeno-canto

The male buff-fronted owl's song is "a rapid, wavering trill, 'frurururururururu'". Dependent fledglings give a "hissing, raspy 'cheet' begging call".[7]
Status

The IUCN had originally assessed the buff-fronted owl as being Near Threatened but in 2004 downlisted it to being of Least Concern.[1] It is generally thought to be rare but is probably overlooked. Its population is unknown and believed to be stable.[7]
References

BirdLife International (2016). "Buff-fronted Owl Aegolius harrisii". IUCN Red List of Threatened Species. 2016. Retrieved 8 September 2021.
Gill, F.; Donsker, D.; Rasmussen, P. (July 2021). "IOC World Bird List (v 11.2)". Retrieved July 14, 2021.
Remsen, 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 24 August 2021. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved August 24, 2021
Cassin, John (1849). "Description of new species of the genera Nyctale, Brehm., and Sycobius, Vieill.; specimens of which are in the collection of the Academy of Natural Sciences of Philadelphia". Proceedings of the Academy of Natural Sciences of Philadelphia. 4: 157–158 [157]. The title page is dated 1848 but the volume was not published until the following year.
Peters, James Lee, ed. (1940). Check-list of Birds of the World. Volume 4. Cambridge, Massachusetts: Harvard University Press. p. 174.
Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 186. ISBN 978-1-4081-2501-4.

Holt, D. W., R. Berkley, C. Deppe, P. L. Enríquez, J. L. Petersen, J. L. Rangel Salazar, K. P. Segars, K. L. Wood, A. Bonan, and J. S. Marks (2020). Buff-fronted Owl (Aegolius harrisii), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.bufowl1.01 retrieved September 8, 2021