Crested owl

The crested owl (Lophostrix cristata) is a species of owl in the family Strigidae. It is the only species (monotypic) in the genus Lophostrix. It is a resident bird and occurs in Central America and northern South America. It is a medium-sized owl, easily recognizable with its very long whitish ear tufts and otherwise darker appearance. It inhabits lowland rainforests and prefers old growth in proximity with water. The crested owl is a strictly nocturnal species, but very little is known about its behaviour.

Crested owl
In Panama
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Strigiformes
Family: Strigidae
Genus: Lophostrix
Lesson, 1836
Species:
L. cristata
Binomial name
Lophostrix cristata
(Daudin, 1800)

Taxonomy

The genus of the crested owl is in the family Strigidae as well as the subfamily Striginae and is traditionally recognized as a part of the tribe Strigini along with Strix, Jubula and Pulsatrix. However, recent analysis suggest that Lophostrix could form its own tribe, Pulsatrigini, with Pulsatrix. [2]

There are three recognized subspecies:[3]

  • Lophostrix cristata cristata (Daudin, 1800)
  • Lophostrix cristata wedeli (Griscom, 1932)
  • Lophostrix cristata stricklandi (Sclater & Salvin, 1859)

It has been suggested that Lophostrix cristata stricklandi could be specifically distinct from Lophostrix cristata on the basis that it has a grey morph, a shorter song and strictly yellow eyes.

Description

The crested owl is a medium-sized owl with a total length ranging from 38 to 43 cm and weighs 425 to 620 grams.[3] It is distinctively recognized with its very long white or buff colored ear tufts and its prominent whitish eyestripe that extends into the ear tufts. The Iris varies from yellow to brown mottled with rufous.[4] The bill is generally yellow or darker and its toes are a pale grey-brown colour.

The mesoptile (down feathers) of juveniles is whitish. Their facial disk is dark, and the ear tufts are short. The flight and tail feathers are similar to adults.[3]

Colour morphs

The adult form has two colour morphs: a dark and a pale morph.[5] A third greyish morph has been described, but it is restricted to the subspecies Lophostrix cristata stricklandi [3]

The dark morph has an overall chocolate-brown colour, with the Crown, facial disk and upper breast in the same deep chocolate colour. The wing coverts and primaries are dotted with white and all flight feathers are barred light and dark. The tail feathers are chocolate brown with some darker mottling and the throat is pale buff.[3]

The light morph individuals have a rufous-brown overall colour and the upper breast has a dark brown collar.[3]

Distribution and habitat

The crested owl is a resident bird throughout its central and south american range.

Distribution

The crested owl is found in Central America and northern South America, where it occurs in Belize, Bolivia, Brazil, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Peru, Suriname, and Venezuela. It is found in the Amazon Basin except in the north-west basin region with western Guyana, Venezuela, and central-eastern Colombia.

Habitat

The crested owl natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical moist montane forest. They live up to 1000m in altitude,[6] and are found in higher abundance where there is undergrowth and the presence of snags.[7] Crested owls also prefer proximity with water. They favor old growth, however they will also occur in undisturbed secondary growth forest.[8] More specifically, they are most abundant in old floodplain forest and are least abundant in primary seasonally flooded swamp forest.[9]

In Mexico, they are found in tropical evergreen and semi-deciduous forests, riparian areas, clearings and foothills.[6]

Behaviour

As with most owls, this species is strictly nocturnal. They generally roost with their pair-member during the day in dense bushes, along forested streams or rivers and like to perch 3 to 10 meters above ground. When the crested owl is disturbed while roosting, it becomes slim and erects its ear tufts high.[3]

Breeding

The crested owl breeds during the dry or early wet season and apparently nest in naturally occurring holes of mature trees.[3]

Diet

This owl feeds mainly on large insects, and they are thought to feed on small vertebrates as well. Bats are estimated to represent only 5% of owl's diet, but they are known to be opportunistic predators. Recent observations described two crested owl preying on Seba's short tailed bat in mist nets.[7]

Vocalization

The characteristic call of the crested owl is usually given when they are perched high in the canopy. The call is low but far carrying Gooooorrr or Broorrr. [4] The song resembles a frog-like croak and can be mistaken by the call of the Bare-Throated Tiger Heron. The song begins with a stuttering rattle k-k-kkkk, which accelerates to a deep, rough and guttural krrrrrao. At a distance the first introductory notes are inaudible. The song is repeated at intervals of a few seconds.[3]

Crested owls tend to be more vocal towards the summer solstice.[10]

Conservation

According to the IUCN red list of threatened species, the crested owl is of least concern as of 2012, with populations classified as stable. Even though the populations are decreasing, the species has an extremely large range and is estimated to have a population of over 10,000 mature individuals. It is suspected to lose 18-21% of suitable habitat within its range over the next 17 years, thus suspected to decline by 25% over three generations.[11] This owl is still fairly common in undisturbed primary forests of the amazon, but could become locally endangered where deforestation takes place.[3]

References
  1. BirdLife International (2012). "Lophostrix cristata". IUCN Red List of Threatened Species. 2012. Retrieved 26 November 2013.CS1 maint: ref=harv (link)
  2. Wink, Michael; El-Sayed, Abdel-Aziz; Sauer-Gürth, Hedi; Gonzalez, Javier (December 2009). "Molecular Phylogeny of Owls (Strigiformes) Inferred from DNA Sequences of the Mitochondrial Cytochromeband the NuclearRAG-1gene". Ardea. 97 (4): 581–591. doi:10.5253/078.097.0425. ISSN 0373-2266.
  3. Becking, Jan-Hendrik; Weick, Friedhelm (2008). Owls of the world. Bloomsbury Publishing PLC.
  4. 1946-, Ridgely, Robert S. (1989). A guide to the birds of Panama : with Costa Rica, Nicaragua, and Honduras. Gwynne, John A. (2nd ed.). Princeton, N.J.: Princeton University Press. ISBN 978-0691085296. OCLC 18521365.CS1 maint: numeric names: authors list (link)
  5. Storer, Robert W. (1972). "The Juvenal Plumage and Relationships of Lophostrix cristata". The Auk. 89 (2): 452–455. doi:10.2307/4084227. JSTOR 4084227.
  6. ENRIQUEZ-ROCHA, Paula; RANGEL-SALAZAR, j. Luis (1993). DENVER W. HOLT. "PRESENCE AND DISTRIBUTION OF MEXICAN OWLS: A REVIEW". The Raptor Research Foundation. 27 (3).
  7. Rocha, Ricardo; López-Baucells, Adrià (17 April 2014). "Opportunistic predation by Crested Owl Lophostrix cristata upon Seba's Short-tailed Bat Carollia perspicillata". Revista Brasileira de Ornitologia - Brazilian Journal of Ornithology. 22 (1): 3. ISSN 2178-7875. Archived from the original on 15 October 2018. Retrieved 15 October 2018.
  8. Sberze, M.; Cohn-Haft, M.; Ferraz, G. (January 2010). "Old growth and secondary forest site occupancy by nocturnal birds in a neotropical landscape". Animal Conservation. 13 (1): 3–11. doi:10.1111/j.1469-1795.2009.00312.x. ISSN 1367-9430.
  9. Lloyd, Huw (2003). "Population Densities of Some Nocturnal Raptor Species (Strigidae) in Southeastern Peru (Densidades poblacionales de algunas especies raptoras nocturnas (Strigidae) en el sureste de Perú)". Journal of Field Ornithology. 74 (4): 376–380. doi:10.1648/0273-8570-74.4.376. JSTOR 4131047.
  10. Rocha, P.L.E; Rangel-Salazar, J.L (2001). "Owl occurrence and calling behavior in a tropical rain forest". Journal of Raptor Research. 35 (2): 107–114.
  11. "Lophostrix cristata (Crested Owl)". IUCN Red List of Threatened Species. Retrieved 15 October 2018.
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