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Madagascar Marsh-harrier Circus macrosceles
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This species qualifies as Vulnerable as it has a very small population which is likely to be declining owing to a variety of threats, principally habitat loss and degradation, and persecution by humans. Recent surveys suggest that the species is rarer than previously thought, and confirmation of these lower population estimates or further elucidation of the subpopulation structure may lead to the species being uplisted to a higher threat category.

Taxonomic source(s)
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

Taxonomic note
Circus maillardi (Sibley and Monroe 1990, 1993) has been split into C. maillardi and C. macrosceles following Simmons (2000).

59 cm. Large harrier. Male blackish on forewing, primaries and mantle, greyer on head, tail and secondaries, with blackish streaks on head and throat. Rump whitish, as in female, which is browner overall with conspicuous bars underneath primaries and on tail. Similar spp. Differs from Black Kite Milvus migrans, Madagascar Buzzard Buteo brachypterus and Madagascar Harrier-hawk Polyboroides radiatus by rather long, narrow wings, white rump, habit of flying low with wings in a "V" and, in male, by contrasting wing pattern.

Distribution and population
Circus macrosceles is confined to the Comoro Islands and Madagascar. It has not been seen recently on Mayotte (to France) (Safford 2001). The species has a broad distribution stretching c.1,000 km from north to south on Madagascar, but occurs at very low densities; surveys in 2005-2006 of 71 % of the potential harrier habitat on the island recorded a total of 80 individuals (René de Roland et al. 2009). The population on Comoros (Grande Comore, Moheli and Anjouan: three separate subpopulations), where its habitat is nearly totally destroyed, is estimated at no more than 50 mature individuals (R. Thorstrom and L.-A. René de Roland in litt. 2007). The total population is estimated to be somewhere in the range 250-500 mature individuals. The Bealanana and Ankozobe regions in Madagascar are particularly important for the species (René de Roland et al. 2009). It is suspected to be declining, but population trends have not yet been accurately quantified.

Population justification
Surveys in 2005-2006 of 71% of the potential harrier habitat in Madagascar recorded a total of 80 individuals. The population on Comoros (three separate subpopulations on Grande Comore, Moheli and Anjouan), where its habitat is nearly totally destroyed, is estimated at no more than 50 mature individuals (R. Thorstrom and L.-A. René de Roland in litt. 2007). The total population is here estimated to be somewhere in the range 270-500 mature individuals, roughly equivalent to 400-750 individuals in total, but this estimate may need to be revised downwards.

Trend justification
The population is suspected to be in moderate decline on the basis of the loss and degradation of breeding habitat, persecution and disturbance.

In Madagascar, it is primarily associated with wetlands, hunting around the periphery of vegetation-fringed lakes, marshes, coastal wetlands and rice-paddies, as well as over savanna grasslands (Langrand 1990), including those that are very degraded (R. Safford in litt. 1999). On the Comoros, it uses a variety of open and forested habitats in drier areas. It feeds on small vertebrates (including birds) and insects (Langrand 1990, Morris and Hawkins 1998). It nests in low vegetation or on the ground in marshes (Morris and Hawkins 1998, René de Roland et al. 2004, 2009). Breeding has been recorded as starting in late August and September, during the middle of the dry season (René de Roland et al. 2004). The incubation period has been observed to be 32-34 days, and nestlings fledge at 42-45 days of age at the start of the rainy season. The species reproduces at a relatively low rate, with mean clutch size recorded as 2.9 eggs, average productivity recorded as 0.9 young fledged per breeding attempt, and three quarters of nests being successful. The diet is comprised of insects, snakes, birds, lizards, rodents and domestic chickens (René de Roland et al. 2004).

In Madagascar, this species is likely to have very poor nesting success owing to the regular and comprehensive burning of grasslands and marshes, especially in the central high-plateau region (to produce fresh grazing areas and to clear land) (René de Roland et al. 2004, 2009, Anon. 2007), and due to egg-hunting and nest-destruction by local people (ZICOMA 1999, A. F. A. Hawkins in litt. 2000). Most savannah fires occur from August to November, thus coinciding with the species's breeding season (René de Roland et al. 2009). For example, in October 2005, all seven nests at Ambohitantely were destroyed by fire during the incubation period, resulting in the loss of all eggs (L-. A. René de Roland in litt. 2006, René de Roland et al. 2009.). Conversion of wetlands for rice farming is also likely to have a negative impact upon the species (René de Roland et al. 2004, 2009, L.-A. René de Roland in litt. 2006, Anon. 2007). Over 80% of marshland in Madagascar has been converted into rice fields (R. Thorstrom and L.-A. René de Roland in litt. 2007), mainly in areas of dense human inhabitation (René de Roland et al. 2009). Nestlings are often taken by people for food, and interviews with local communities have revealed that adults are also hunted for food (Anon. 2007, René de Roland et al. 2009). The species is also persecuted because of its threat to poultry, however, in one study of breeding birds, domestic chickens accounted for only 1% of prey items (René de Roland et al. 2004). The disturbance of marshes appears to limit the number of breeding pairs present, and human activities during the cultivation period may force the movement of birds. The species requires undisturbed areas with unaltered savannah, however land-use activities have rendered it absent from many areas of Madagascar (René de Roland et al. 2009).

Conservation Actions Underway
CITES Appendix II. It has been recorded from a number of protected areas, including five National Parks, one Strict Reserve, one Special Reserve, one Classified Forest and one Hunting Reserve (ZICOMA 1999). However, the protection of the marshes and grasslands that are vital for the species is relatively neglected compared with the protection of forest in Madagascar (René de Roland et al. 2004, 2009). The species is the subject of research into its population (René de Roland et al. 2009, L.- A. René de Roland in litt. 2006, Anon. 2007) and breeding biology (René de Roland et al. 2004). Conservation Actions Proposed
Carry out further surveys to confirm the total population size. Study the species's population dynamics (René de Roland et al. 2004). Obtain more accurate estimates of nesting success, and investigate relative importance of different mortality factors at nest. Reduce burning at key sites, particularly during the breeding season when fires destroy nests. Identify and establish protected areas to conserve key nesting sites. Improve protection of marshes and grasslands (René de Roland et al. 2009). Raise awareness amongst local communities about the impacts of fire (René de Roland et al. 2009). Study the species's ecology on Comoros (René de Roland et al. 2009).

Anon. 2007. Madagascar project. Peregrine Fund Annual Report 2006: 28-30.

De Roland, L.-A. R.; Thorstrom, R.; Razafimanjato, G.; Rakotondratsima, M. P. H.; Andriamalala, T. R. A.; The Seing Sam. 2009. Surveys, distribution and current status of the Madagascar Harrier Circus macrosceles in Madagascar. Bird Conservation International 19: 309-322.

Langrand, O. 1990. Guide to the birds of Madagascar. Yale University Press, New Haven, USA.

Morris, P.; Hawkins, F. 1998. Birds of Madagascar: a photographic guide. Pica Press, Robertsbridge, UK.

Rene de Roland, L. A.; Razafimanjato, G.; The Seing Sam. in prep. Distribution, density and the major threats of Madagascar Harrier Circus macrosceles throughout Madagascar.

Safford, R. J. 2001. Comoros. In: Fishpool, L.D.C.; Evans, M.I. (ed.), Important Bird Areas in Africa and associated islands: Priority sites for conservation, pp. 185-190. Pisces Publications and BirdLife International (BirdLife Conservation Series No.11), Newbury and Cambridge, UK.

ZICOMA. 1999. Zones d'Importance pour la Conservation des Oiseaux a Madagascar.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Bird, J., Butchart, S., Ekstrom, J., Evans, M., Symes, A., Taylor, J.

Hawkins, F., Rabarisoa, R., Rene de Roland, L., Safford, R., Thorstrom, R.

IUCN Red List evaluators
Butchart, S., Taylor, J.

Recommended citation
BirdLife International (2016) Species factsheet: Circus macrosceles. Downloaded from on 28/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 28/10/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Madagascar harrier (Circus macrosceles) 0

Key facts
Current IUCN Red List category Vulnerable
Family Accipitridae (Hawks, Eagles)
Species name author Newton, 1863
Population size 270-500 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 594,000 km2
Country endemic? No
Links to further information
- Additional Information on this species