The Madagascar fish eagle (''Haliaeetus vociferoides'') or Madagascar sea-eagle (to distinguish it from the ''Ichthyophaga'' fishing-eagles), is a large
bird of prey
Birds of prey or predatory birds, also known as raptors, are hypercarnivorous bird species that actively hunt and feed on other vertebrates (mainly mammals, reptiles and other smaller birds). In addition to speed and strength, these predators h ...
in the family
Accipitridae
The Accipitridae is one of the three families within the order Accipitriformes, and is a family of small to large birds with strongly hooked bills and variable morphology based on diet. They feed on a range of prey items from insects to medium-s ...
which also includes many other diurnal
raptor
Raptor or RAPTOR may refer to:
Animals
The word "raptor" refers to several groups of bird-like dinosaurs which primarily capture and subdue/kill prey with their talons.
* Raptor (bird) or bird of prey, a bird that primarily hunts and feeds on v ...
s such as
kite
A kite is a tethered heavier than air flight, heavier-than-air or lighter-than-air craft with wing surfaces that react against the air to create Lift (force), lift and Drag (physics), drag forces. A kite consists of wings, tethers and anchors. ...
s,
buzzard
Buzzard is the common name of several species of birds of prey.
''Buteo'' species
* Archer's buzzard (''Buteo archeri'')
* Augur buzzard (''Buteo augur'')
* Broad-winged hawk (''Buteo platypterus'')
* Common buzzard (''Buteo buteo'')
* Eastern ...
s and
harriers. It is
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the coastal strip in the northwest of Madagascar. It is about long and has a pale brown head, dark brown body and white tail. The Madagascan fish eagle has been suffering from a declining population and is threatened by
habitat destruction
Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...
and persecution, and the
International Union for Conservation of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
has rated its conservation status as being "
critically endangered".
Description
The Madagascar fish eagle is a medium-sized
sea eagle
A sea eagle or fish eagle (also called erne or ern, mostly in reference to the white-tailed eagle) is any of the birds of prey in the genus ''Haliaeetus'' in the bird of prey family Accipitridae.
Taxonomy and evolution
The genus ''Haliaeetus'' ...
, long and with a wingspan of . The body and wings are dark brown, with a pale brown head and a white tail; the bill is blackish with a paler base, and the legs are pale grey. Males weigh , while the slightly larger females weigh .
Its closest relative is the
African fish eagle
The African fish eagle (''Haliaeetus vocifer'') or the African sea eagle, is a large species of eagle found throughout sub-Saharan Africa wherever large bodies of open water with an abundant food supply occur. It is the national bird of Malawi, Na ...
, ''Haliaeetus vocifer''. Together, they form a distinct
species pair
In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth ...
lineage of sea-eagles, which separated soon after the divergence of the genus; they retain the ancestral dark beak, talon, and eye, but unlike other ''Haliaeetus'' species, they always have at least partially white tails, even while juvenile. As in other sea-eagle species pairs, one species (the Madagascan fish eagle in this case) has a tan head, while the other has a white one.
Distribution
This
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
is endemic to
Madagascar
Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa ...
, where it survives in low numbers along the northwest coast north of
Morondava
Morondava (, from mg, morona lava "long coast") is a city located in Menabe Region, of which it is the capital, in Madagascar. It is located in the delta of the Morandava River at . Its population as of the 2018 census, was 53,510.
Population
T ...
. The range of this eagle is within the
Madagascar dry deciduous forests
The Madagascar dry deciduous forests represent a tropical dry forest ecoregion situated in the western and northern part of Madagascar. The area has high numbers of endemic plant and animal species but has suffered large-scale clearance for agric ...
. The principal locus of population according to the United Nations Environmental Programme is in the
Analova region; 20 to 25 breeding pairs were there as of the 1980s. A more recent survey by Garbutt and Hogan report a smaller concentration of at least three breeding pairs in the
Anjajavy Forest The Anjajavy's Protected Area is located on a peninsula of the town of Antonibe, in the district of Analalava and in the north-west region of Madagascar. It is part of the Sofia region of the independent province of Mahajanga and its position is be ...
along the
Indian Ocean
The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by th ...
, where several streams discharge north of
Anjajavy Village.
Status
Total population estimates from the United Nations and from Grambo
[Rebecca L. Grambo, "Eagles" (1.000.000.00bc) Published by Voyageur Press, Inc.] place the world population of this species at about 40 breeding pairs; according to Grambo this bird may be one of the rarest birds on Earth. Other surveys between 1991 and 1995 recorded at least 222 adults from 105 sites, with an estimated 98 breeding pairs.
The main threats to its breeding habitat are
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 d ...
,
soil erosion
Soil erosion is the denudation or wearing away of the upper layer of soil. It is a form of soil degradation. This natural process is caused by the dynamic activity of erosive agents, that is, water, ice (glaciers), snow, air (wind), plants, and ...
and the development of wetland areas for
rice paddies
A paddy field is a flooded field of arable land used for growing semiaquatic crops, most notably rice and taro. It originates from the Neolithic rice-farming cultures of the Yangtze River basin in southern China, associated with pre-Aust ...
. It is also in direct competition with humans for fish stocks. Because of its decline in numbers and the threats it faces, the
International Union for Conservation of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
has assessed the bird's conservation status as being "
critically endangered".
Gallery
Image:Madagascarfisheagle.jpg, At Tsimbazaza Zoo, Antananarivo
Antananarivo ( French: ''Tananarive'', ), also known by its colonial shorthand form Tana, is the capital and largest city of Madagascar. The administrative area of the city, known as Antananarivo-Renivohitra ("Antananarivo-Mother Hill" or "An ...
Image:Madagascar fish-eagle haliaeetus vociferoides.jpg, ''Haliaeetus vociferoides'' in the Anjajavy Forest The Anjajavy's Protected Area is located on a peninsula of the town of Antonibe, in the district of Analalava and in the north-west region of Madagascar. It is part of the Sofia region of the independent province of Mahajanga and its position is be ...
Footnotes
; References
*
*
; Cited works
*
{{Authority control
Madagascar fish eagle
The Madagascar fish eagle (''Haliaeetus vociferoides'') or Madagascar sea-eagle (to distinguish it from the ''Ichthyophaga'' fishing-eagles), is a large bird of prey in the family Accipitridae which also includes many other diurnal raptors such a ...
Endemic birds of Madagascar
Birds of prey of Madagascar
Critically endangered fauna of Africa
Madagascar fish eagle
The Madagascar fish eagle (''Haliaeetus vociferoides'') or Madagascar sea-eagle (to distinguish it from the ''Ichthyophaga'' fishing-eagles), is a large bird of prey in the family Accipitridae which also includes many other diurnal raptors such a ...