Marsh owl (Asio capensis)

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Marsh owl in flight
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Marsh owl fact file

Marsh owl description

KingdomAnimalia
PhylumChordata
ClassAves
OrderStrigiformes
FamilyStrigidae
GenusAsio (1)

Distinctive of many African wetlands and savannas, the marsh owl is a medium-sized owl, with a round head and small inconspicuous ear tufts. The tail barring and wing feathers are buffish in colour, while the underside of the body may be darkly barred (2). The eyes are surrounded by conspicuous dark rings and the greyish bill has a black tip. Marsh owls exhibit sexual dimorphism and the sexes are distinguished by the females’ larger size and longer tail (4). Juveniles have a dark facial disk that is outlined in black (2).

Three subspecies of marsh owl are recognised: Asio capensis tingitanus is distinguished from the nominate subspecies A. c. capensis by white spotting and rufous colouration on the underparts, while A. c. hova is distinguished by larger distinct barring across the body (2).

Also known as
African marsh owl.
French
Hibou des marais africain.
Size
Head-body length: 29 – 36 cm (2)
Wingspan: 82 – 99 cm (2)
Weight
225 – 375 g (2)
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Marsh owl biology

An efficient hunter, the marsh owl soars silently in the air with steady wingbeats and short glides. As a generalist feeder, the marsh owl consumes a large variety of prey including small mammals, such as rodents and mustelids, birds, amphibians, reptiles and large insects (2). Active at night and during the day, the marsh owl uses its acute eyesight to spot prey, which is caught in large talons, before being taken to a hidden location and eaten (9).

The breeding season peaks in March in North Africa and between December and April in Southwest Africa, with shallow nests constructed on the ground in a tuft of dense tall grass. A brood of two to three eggs is incubated by the female for approximately 28 days, with offspring fledging around 35 days after hatching (2).

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Marsh owl range

The marsh owl has an extensive range throughout much of southern and Central Africa, extending from South Africa to Ethiopia and Madagascar, with scattered populations in West Africa including Cameroon, Chad, Morocco and Senegal (2). The marsh owl is non-migratory, but seasonal movements may occur in response to fluctuations in rainfall, and vagrants have been recorded as far north as Portugal, Spain and the Canary Islands (2) (3) (5) (6)A. c. tingitanus is endemic to northwest Morocco, A. c. capensis occurs in scattered populations across West Africa from Senegal, to Chad and Cameroon, and from Sudan and Ethiopia south towards the Cape of South Africa, avoiding the most arid areas, while A. c. hova is endemic to the island of Madagascar (2). The marsh owl formerly occurred in Algeria, but is now believed to be locally extinct there (3). Found up to 1,500 metres above sea level, the marsh owl is reportedly most abundant between 1,300 and 2,000 metres in Kenya (7) (8).

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Marsh owl habitat

The species’ name may suggest that it is restricted to marshes, but the marsh owl can be found within a multitude of habitats, ranging from estuarine marshes and mangroves, to sub-tropical grasslands, open savannas, inland wetlands and agricultural areas (7). It is likely that seasonal fluctuations in rainfall and water availability influence habitat selection throughout the marsh owl’s range (2).

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Marsh owl status

Classified as Least Concern (LC) on the IUCN Red List (1) and listed on Appendix II of CITES (3).

IUCN Red List species status – Least Concern

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Marsh owl threats

As the marsh owl is found in a number of habitats, threats vary between localities. In Morocco there are a reportedly low number of breeding pairs due to habitat degradation, and the species may also occur at low densitites in Madagascar. Throughout the species’ range, marsh owl foraging and nesting habitat may be altered through overgrazing by livestock, drainage of wetlands, grassland fires and habitat degradation from human encroachment (2).

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Marsh owl conservation

Listed as Least Concern on the IUCN Red List of Threatened Species, the marsh owl is believed to be common throughout much of its extensive range, with no evidence of a decline (1) (7).   The marsh owl is also present in a large number of protected areas, and is reportedly common in Kruger National Park in South Africa (2) (9). Furthermore, wetland habitats used by the marsh owl are also protected in countries that have ratified the Ramsar convention and the African-Eurasian Waterbird Agreement (10) (11).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For more information on bird conservation projects in Africa, see:

For more information on this and other bird species please see:

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Authentication

Authenticated (15/03/10) by André Botha, Manager of the Birds of Prey Working Group of the Endangered Wildlife Trust, South Africa. 
http://www.ewt.org.za/home.aspx

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Glossary

Amphibians
Cold-blooded vertebrates of the class Amphibia, such as frogs or salamanders, which characteristically hatch as aquatic larvae with gills. The larvae then transform into adults with air-breathing lungs.
Endemic
A species or taxonomic group that is only found in one particular country or geographic area.
Incubate
To keep eggs warm so that development is possible.
Mustelids
A family of carnivores with short, stocky legs, an elongated body and long, sharp canine teeth. Includes otters, weasels, ferrets and badgers.
Nominate subspecies
The subspecies indicated by the repetition of the specific name. Thus, in this case the Asio capensis capensis is the nominate subspecies of A. c. hova.
Sexual dimorphism
When males and females of the same species differ in appearance.
Subspecies
A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
Vagrant
Found occasionally outside normal range.
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References

  1. IUCN Red List (January, 2010)
    http://www.iucnredlist.org
  2. del Hoyo, J., Elliott, A. and Sargatal, J. (1994) Handbook of the Birds of the World - New World Vultures To Guineafowl. Vol. 2. Lynx Edicions, Barcelona.
  3. CITES (January, 2010)
    http://www.cites.org
  4. Ansara-Ross, T.M., Wepener, V., Verdoorn, G.H. and Ross, M.J. (2008) Sexual dimorphism of four owl species in South Africa. Ostrich, 79: 83-86.
  5. Global Register of Migratory Species (January, 2010)
    http://www.groms.de/
  6. Smalley, M.E. (1983) The marsh owl Asio capensis: A wet season migrant to the Gambia. Malimbus, 5: 31-33. Available at:
    http://malimbus.free.fr/articles/V5/05031033.pdf
  7. BirdLife International (January, 2010)
    http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=2323&m=1
  8. Kenya Birds (January, 2010)
    http://www.kenyabirds.org.uk/
  9. Biodiversity Explorer: The web of life in South Africa (January, 2010)
    http://www.biodiversityexplorer.org/
  10. The Ramsar Convention on Wetlands (January, 2010)
    http://www.ramsar.org/
  11. The African-Eurasian Waterbird Agreement (January, 2010)
    http://www.unep-aewa.org/
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Image credit

Marsh owl in flight  
Marsh owl in flight

© Dr Warwick Tarboton

Warwick Tarboton
Tarboton
P.O. Box 327
0510
Modimolle
South Africa
wtarbotn@iafrica.com

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