In addition, hybridization can occur with these paradise whydahs. Brood parasites include birds in different families such as cowbirds, whydahs, cuckoos, and black-headed ducks. Researchers discovered that these paradise whydahs mimic the songs of Melba Finch. The birds named "whydahs" have long or very long tails in the breeding male. The whydahs have long or very long tails. These long-tailed paradise whydahs are hard to distinguish between males and females. Some of the firefinches and pytilias are hosts to the brood-parasitic indigobirds and whydahs, respectively. Other than the beauty, the paradise whydahs can be a nuisance especially for farmers. The nestling whydahs mimic the gape pattern of the fledglings of the host species. The indigobirds and whydahs, are small passerine birds native to Africa. Its closest relatives are thought to be the indigobirds and whydahs of the genus "Vidua". Majority of the time, these whydahs stay away from surface waters. Indigobirds and whydahs imitate their host's song, which the males learn in the nest. Usually, the whydahs look like ordinary sparrows with short tails during the non-breeding season. Unlike the cuckoos and honeyguides, the indigobirds and whydahs do not destroy the host's eggs.