Vedova del paradiso orientale

Identificazione

Viduidae species differ from one another in size, in breeding plumage and color, and in the songs used for mating. These long-tailed paradise whydahs are hard to distinguish between males and females. Usually these paradise whydah finches grow to about 13 centimeters in length and weigh about 21 grams. Female whydahs tend to have a grey bill and feathers that are greyish-brown with blackish streaks along with their under tail feather being more white. Similarly, males during the non-breeding season tend to have mostly browner plumage with black stripes on the crown, black parts along the face, and deeper brown color for the chest and creamer color for the abdomen However, breeding males have black heads and back, the rusty colored breast, a bright yellow nape, and white abdomen with broad, elongated black tail feathers that can grow up to 36 centimeters or more.

Tassonomia

The long-tailed paradise whydah was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Emberiza paradisaea. It is now placed in the genus Vidua that was introduced by the French naturalist Georges Cuvier in 1816.<p>The long-tailed paradise whydahs are brood-parasitic birds along with the rest of the species in the family Viduidae. Primary host species include the Viduidae and the Estrildidae, also known as the waxbills. They diverged about 20 million years ago. Most have included Viduidae within Estrilididae or Ploceidae (weavers) in a subfamily of its own. Similarly, Anomalospiza have been switched around between the two families and have not been linked with Vidua. However, studies has shown that the skull, the bony palate, the horny palate and the pterylosis are some of the morphological characters that support a close relationship between Anomalospiza and Vidua which are different from the weavers. Indigobirds are also part of the family Viduidae. The long-tailed whydah's relationship with the indigobirds are not very well-known. The indigobirds are more closely related to the straw-tailed whydah based on their phylogenetic relationship where researchers analyzed mitochondrial restriction sites and nucleotide sequences.

Nome scientifico

Vidua paradisaea

Autorità

(Linnaeus, 1758)

Ordine

Passeriformi

Famiglia

Viduidi

Genere

Vidua

Areale e habitat

The long-tailed paradise whydahs are found in grassland, savanna and open woodland where they live in bushed grassland around cultivation. Majority of the time, these whydahs stay away from surface waters.

Migrazione

Resident species

Comportamento

The long-tailed paradise whydah are known to be brood parasites where they would lay their eggs in nests of other songbirds. Furthermore, they usually roost together in flocks during both breeding and non-breeding seasons. Males develop the ability to mimic songs of their host. Studies showed that female whydahs respond more strongly to songs mimicked by males of their own species than they do to closely related species. Females use this mimicry to eliminate among potential mates and prefer those raised by the same host species. Researchers discovered that hybridization can occur when female whydahs do not choose mates based on their song mimicry but instead on male traits such as plumage and flight displays if it is more important to them than song, or is restricted by the availability of males singing the appropriate host songs or if males is involved with unsolicited copulation with females of other parasitic species. Researchers discovered that these paradise whydahs mimic the songs of Melba Finch.<p>Additionally, these paradise whydahs are granivorous where they feed on small seed that ripen and fall on the ground. For foraging, these finches use something called “double scratch” where they utilize both of their feet almost simultaneously scratching the ground to find seeds in dust and hop backwards to pick up the seed. Another technique they use is their tongue. They would dehusks grass seeds with their bill rolling the seeds with their tongue one at a time back and forth against the ridge of the palate.

Conservazione

Tendenza della popolazione

stable