society-finch
The Bengalese finch (Lonchura striata domestica), known in the United States as the society finch, is not a naturally-occurring species but rather a fertile hybrid. It is the most domesticated of the "finches" (it is actually a Munia) but its ancestry is the subject of debate. Nobody is quite certain which wild finches the Bengalese is descended from, but the Striated Finch and the White-rumped Munia are thought to have played a considerable role in their development. They are well adapted to captivity and do well in the company of humans. They breed well and are good foster parents for other finch-like species.
While two males may not get along without other company, it has been found the best "pairing" for fostering is to use two males, this works better than either two females or a male and female pairing. Two males will usually accept eggs, or even partly grown young without any hesitation.
It is mostly accepted that these birds have been bred in Japan for some 250 years, and over the years, breeders have managed to breed lots of colour variations including fawn, chocolate brown, pied and etc. There is also a very attractive crested variety of the Bengalese. Over the centuries individual colour patterns have been developed. For instance, one Japanese family may have developed all white birds with black wings, while another family may breed ginger birds with white heads etc. Development of these strains has taken several generations of the one Japanese family to perfect.
These birds are a very close flock species and tend to all roost in the one nest if kept in a group. This tends to make breeding harder in an aviary situation, and they breed better if kept as single pairs in individual breeding boxes [as used for Canaries and Budgies]. This close flocking behaviour is also responsible for their American name of "Society Finch".
--source Wikipedia.Org--
--http://www.twolittlefinches.com/society-finches.html--
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