The African silverbill (''Euodice cantans'') is a small
passerine
A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped'), which includes more than half of all bird species. Sometimes known as perching birds, passerines are distinguished from other orders of birds by t ...
bird formerly considered conspecific with the Asian species
Indian silverbill
The Indian silverbill or white-throated munia (''Euodice malabarica'') is a small passerine bird found in the Indian Subcontinent and adjoining regions that was formerly considered to include the closely related African silverbill (''Euodice cant ...
, (''Euodice malabarica''). This
estrildid finch
Estrildidae, or estrildid finches, is a family of small seed-eating passerine birds of the Old World tropics and Australasia. They comprise species commonly known as munias, mannikins, firefinches, parrotfinches and waxbills. Despite the word "fi ...
is a common resident breeding bird in dry savanna habitat, south of the
Sahara Desert
, photo = Sahara real color.jpg
, photo_caption = The Sahara taken by Apollo 17 astronauts, 1972
, map =
, map_image =
, location =
, country =
, country1 =
, ...
. This species has also been introduced to other countries such as
Portugal
Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of ...
,
Qatar
Qatar (, ; ar, قطر, Qaá¹ar ; local vernacular pronunciation: ), officially the State of Qatar,) is a country in Western Asia. It occupies the Qatar Peninsula on the northeastern coast of the Arabian Peninsula in the Middle East; it sh ...
and United States.
Taxonomy
The African silverbill was
formally described in 1789 by the German naturalist
Johann Friedrich Gmelin
, fields =
, workplaces = University of GöttingenUniversity of Tübingen
, alma_mater = University of Tübingen
, doctoral_advisor = Philipp Friedrich GmelinFerdinand Christoph Oetinger
, academic_advisors =
, doctora ...
under the
binomial name
In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
''Loxia cantans''. The specific epithet is from
Latin
Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
and means "singing". Gmemlin specified the
locality
Locality may refer to:
* Locality (association), an association of community regeneration organizations in England
* Locality (linguistics)
* Locality (settlement)
* Suburbs and localities (Australia), in which a locality is a geographic subdivis ...
as Africa but this was restricted to
Dakar
Dakar ( ; ; wo, Ndakaaru) (from daqaar ''tamarind''), is the capital and largest city of Senegal. The city of Dakar proper has a population of 1,030,594, whereas the population of the Dakar metropolitan area is estimated at 3.94 million in 2 ...
in
Senegal
Senegal,; Wolof: ''Senegaal''; Pulaar: 𞤅𞤫𞤲𞤫𞤺𞤢𞥄𞤤𞤠(Senegaali); Arabic: السنغال ''As-Sinighal'') officially the Republic of Senegal,; Wolof: ''Réewum Senegaal''; Pulaar : 𞤈𞤫𞤲𞤣𞤢𞥄𞤲𞤣𞤠ðž ...
by
William Lutley Sclater
William Lutley Sclater (23 September 1863 – 4 July 1944) was a British zoologist and museum director. He was the son of Philip Lutley Sclater and was named after his paternal grandfather, also William Lutley Sclater.
Life
William's mother, J ...
and
Cyril Mackworth-Praed in 1918. It is now placed in the
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
''
Euodice
''Euodice'' is a genus of small seed-eating birds in the family Estrildidae. These species are from the dry zones of Africa and India and are commonly referred to as silverbills. They were formerly included in the genus ''Lonchura''.
The grey-h ...
'' that was introduced in 1862 by the German naturalist
Ludwig Reichenbach
Heinrich Gottlieb Ludwig Reichenbach (8 January 1793 – 17 March 1879) was a German botanist and ornithologist. It was he who first requested Leopold Blaschka to make a set of glass marine invertebrate models for scientific education and museu ...
.
In early literature, the African silverbill (''Euodice cantans'') and the Indian silverbill (''E. malabarica'') were treated as
conspecific
Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species.
Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organ ...
. In 1943,
Jean Théodore Delacour
Jean Théodore Delacour (26 September 1890 – 5 November 1985) was a French ornithologist and aviculturist. He later became American. He was renowned for not only discovering but also rearing some of the rarest birds in the world. He establish ...
firmly united both species in his revision of the Estrildinae. However, in 1964,
Colin Harrison first studied the two in a strictly comparative manner and concluded that they were two separate species. He discovered that although the call notes were similar, the songs are distinctly different in form, but sharing a common pattern. They are sympatric in the south of the Arabian Peninsula and there is no record of natural hybridization. From Harrison's personal observation of birds in captivity, each of the two forms evinced a preference for its own kind. A
molecular phylogenetic
Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
study of the Estrildidae published in 2020 found that the African and Indian silverbills were
sister species
In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree.
Definition
The expression is most easily illustrated by a cladogram:
Taxon A and t ...
that had diverged around one million years ago. The two species formed a
clade
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...
that was
basal to members of the genus ''
Lonchura
''Lonchura'' is a genus of the estrildid finch family, and includes munias (or minias) and mannikins. They are seedeating birds that are found in South Asia from India, Bangladesh, Sri Lanka east to Indonesia, Papua New Guinea, and the Philippine ...
''.
Subspecies
Two subspecies are recognised:
[
* ''E. c. cantans'' (Nominate race) occurs in west and central Africa
* ''E. c. orientalis'' occurs in east Africa and the Arabian Peninsula
]
Description
The African silverbill is approximately in length with a long black pointed tail. The adult has a stubby silver-blue bill, finely vermiculated light-brown upper parts, whitish underparts, black rump and black wings. The sexes are similar, but immatures lack the vermiculations. This species has a ''tseep'' call and a trilling song. The contact call of the male is a single ''tseep'' while the female is a double noted ''tsiptsip''. Birds in flight keep up a constant ''tseep tseep tseep''.
The subspecies ''E. c. orientalis'' is darker on the face and upperparts than the other subspecies.
Distribution and habitat
The species is widespread in savanna country, arid landscape with thorn bush, and grasslands with acacia
''Acacia'', commonly known as the wattles or acacias, is a large genus of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa and Australasia. The genus na ...
s or dry grassland. It may also be found in cultivated areas and dry grassland. It is by nature a bird of dry country. It is primarily a lowland species but can be found up to altitude.
Behaviour
The African silverbill is tame and sociable, often found perching in trees in dense flocks, touching one another. However, it is a particularly inactive bird, sitting huddled together for a long period of time. It stays in flocks all year round and usually breeds in loose colony.
Feeding
The African silverbill feeds mostly on grass seeds, picked from the ground but also taken from the growing plants if available. It will cling to grass stems to take seeds from the inflorescences. It seems that it feeds mainly on vegetable matter and rearing its young on seed as well. However, it has been recorded to take aphids from water mint (Meinertzhagen 1954).
Courtship
The male displays by grasping a stem of grass at one end, and hops or files to near the female. At once he sleeks down his feathers, stands upright with tail straight down, and jerks his head upwards a few times. He then leans forward, twists his tail towards the female and fluffs his flank and belly feathers. At this stage he usually drops the straw and begins to sing and dance. The flank and ventral feathers are not always fluffed out, and the intensity of the display probably depends on the relationship of the two birds. If the female seems receptive the male will attempt copulation. However, most displays come to an end before this final phase is reached. Successful mating is usually followed by a little bill fencing and mutual preening (Baptista and Horblit 1990).
Breeding
The nest of the African silverbill is usually built in the form of a roundish bundle of grasses. It is lined with soft fibres and sometimes feathers, and may be placed in a thick bush or hedge or amongst the creepers on a house. The male is recorded in the wild as collecting all the nesting material (Meinertzhagen 1954), while the female only shares in construction.
The clutch varies from three to six oval, smooth white eggs. The female incubates during the day, and though the male may relieve her when she leaves the nest to feed. It has been suggested that the male does not actually brood (Soderberg 1956). They are both at nest at night. The incubation period is about eleven to thirteen days average, and the young fledging in about twenty-one days and becoming independent within a month of fledging.
Newly hatched young are dark and have waxy-looking yellow gape
The beak, bill, or rostrum is an external anatomical structure found mostly in birds, but also in turtles, non-avian dinosaurs and a few mammals. A beak is used for eating, preening, manipulating objects, killing prey, fighting, probing for food ...
swellings. The plate has a single heavy black circle inside the white mouth flange, which embraces the upper and lower parts of the gape.
Threats
The African silverbill is currently trapped for the cage bird trade. However, its numbers and its considerable range mean that this is unlikely to have any impact on the species' survival.
References
* ''Birds of The Gambia'' Barlow, Wacher and Disley,
BirdLife Species Factsheet
* ''Munias and Mannikins'' by Robin Restall,
{{Taxonbar, from=Q994413
African silverbill
The African silverbill (''Euodice cantans'') is a small passerine bird formerly considered conspecific with the Asian species Indian silverbill, (''Euodice malabarica''). This estrildid finch is a common resident breeding bird in dry savanna ...
African silverbill
The African silverbill (''Euodice cantans'') is a small passerine bird formerly considered conspecific with the Asian species Indian silverbill, (''Euodice malabarica''). This estrildid finch is a common resident breeding bird in dry savanna ...
African silverbill
The African silverbill (''Euodice cantans'') is a small passerine bird formerly considered conspecific with the Asian species Indian silverbill, (''Euodice malabarica''). This estrildid finch is a common resident breeding bird in dry savanna ...
Birds of the Arabian Peninsula
African silverbill
The African silverbill (''Euodice cantans'') is a small passerine bird formerly considered conspecific with the Asian species Indian silverbill, (''Euodice malabarica''). This estrildid finch is a common resident breeding bird in dry savanna ...
Taxa named by Johann Friedrich Gmelin