The indigobirds and whydahs, are a family, Viduidae, of small passerine birds native to Africa.

These are finch-like species which usually have black or indigo predominating in their plumage. The birds named "whydahs" have long or very long tails in the breeding male.

All are brood parasites, which lay their eggs in the nests of estrildid finch species; most indigobirds use firefinches as hosts, whereas the paradise whydahs chose pytilias.

Unlike the cuckoo, 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 firefinches.

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 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.

Genus Vidua
Village indigobird, Vidua chalybeata
Jambandu indigobird, Vidua raricola
Barka indigobird, Vidua larvaticola
Jos Plateau indigobird, Vidua maryae
Quailfinch indigobird, Vidua nigeriae
Dusky indigobird or variable indigobird, Vidua funerea
Zambezi indigobird or green indigobird, Vidua codringtoni
Purple indigobird or dusky indigobird, Vidua purpurascens
Wilson's indigobird or pale-winged indigobird, Vidua wilsoni
Cameroon indigobird, Vidua camerunensis
Steel-blue whydah, Vidua hypocherina
Straw-tailed whydah, Vidua fischeri
Shaft-tailed whydah, Vidua regia
Pin-tailed whydah, Vidua macroura
Togo paradise whydah, Vidua togoensis
Exclamatory paradise whydah or long-tailed paradise whydah, Vidua interjecta
Long-tailed paradise whydah or eastern paradise whydah, Vidua paradisaea
Sahel paradise whydah or northern paradise whydah, Vidua orientalis
Broad-tailed paradise whydah, Vidua obtusa
Genus Anamalospiza
Cuckoo finch or parasitic weaver, Anomalospiza imberbis