The indigobirds, whydahs and
cuckoo-finch
The cuckoo-finch (''Anomalospiza imberbis''), also known as the parasitic weaver or cuckoo weaver, is a small passerine bird now placed in the family Viduidae with the indigobirds and whydahs. It occurs in grassland in Africa south of the Sahara. ...
make up the family Viduidae; they are 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 generally have an anisodactyl arrangement of their ...
birds native to
Africa
Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...
.
These are
finch-like species which usually have black or indigo predominating in their plumage. The birds named "whydahs"
[The yellow-mantled widowbird was the type species of its genus, and was originally named from the city of ]Ouidah
Ouidah (English: ; French: ) or Whydah (; ''Ouidah'', ''Juida'', and ''Juda'' by the French; ''Ajudá'' by the Portuguese; and ''Fida'' by the Dutch), and known locally as Glexwe, formerly the chief port of the Kingdom of Whydah, is a city on t ...
in Benin. Nowadays the name whydah (i.e. Ouidah) is however applied to the long-tailed species of the Viduidae. have long or very long tails in the breeding male.
All are obligate
brood parasite
Brood may refer to:
Nature
* Brood, a collective term for offspring
* Brooding, the incubation of bird eggs by their parents
* Bee brood, the young of a beehive
* Individual broods of North American periodical cicadas:
** Brood X, the largest ...
s, which lay their eggs in the nests of
songbird
A songbird is a bird belonging to the suborder Passeri of the perching birds (Passeriformes). Another name that is sometimes seen as the scientific or vernacular name is Oscines, from Latin ''oscen'', "songbird". The Passeriformes contains 5,00 ...
species; most indigobirds use
firefinches as hosts, whereas the paradise whydahs choose
pytilias and the cuckoo-finch parasitises
cisticolids. Unlike the
cuckoo
Cuckoos are birds in the Cuculidae ( ) family, the sole taxon in the order Cuculiformes ( ). The cuckoo family includes the common or European cuckoo, roadrunners, koels, malkohas, couas, coucals, and anis. The coucals and anis are somet ...
s and
honeyguide
Honeyguides (family (biology), family Indicatoridae) are a family of birds in the order Piciformes. They are also known as indicator birds, or honey birds, although the latter term is also used more narrowly to refer to species of the genus ''Pro ...
s, the indigobirds and whydahs do not destroy the host's eggs. Typically, they lay 2–4 eggs in with those already present. The eggs of both the host and the victim are white, although the indigobird's are slightly larger. Many of the indigo-plumaged species named "indigobirds" are very similar in appearance, with the males difficult to separate in the field, and the young and females near impossible. The best guide is often the estrildid finch with which they are associating, since each indigobird parasitises a different host species. For example, the
village indigobird is usually found with
red-billed firefinch
The red-billed firefinch or Senegal firefinch (''Lagonosticta senegala'') is a small seed-eating bird in the family Estrildidae. This is a resident breeding bird in most of Sub-Saharan Africa with an estimated global extent of occurrence of 10,00 ...
es. Indigobirds and whydahs imitate their host's song, which the males learn in the nest. Although females do not sing, they also learn to recognise the song, and choose males with the same song, thus perpetuating the link between each species of indigobird and firefinch. The nestling indigobirds mimic the unique
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 pecking, grasping, and holding (in probing for food, eating, manipulating and ca ...
pattern of the fledglings of the host species.
The matching with the host is the driving force behind speciation in this family, but the close genetic and morphological similarities among species suggest that they are of recent origin.
The family contains two genera:
References
Sources
*
External links
Whydahs and indigobirds (Viduidae)information, including 7 species with videos and 9 with photographs at th
Internet Bird CollectionIndigobirds.com
{{Authority control
Bird families
Brood parasites
Birds of Sub-Saharan Africa