Chestnut-breasted mannikin

The chestnut-breasted mannikin (Lonchura castaneothorax), also known as the chestnut-breasted munia or bully bird (in Australia), is a small brown-backed munia with a black face and greyish crown and nape. It has a broad ferruginous breast bar above a white belly. The species is found in Australia, New Caledonia, Indonesia, and Papua New Guinea. This species has also been introduced to French Polynesia.

The chestnut-breasted mannikin has a total of six subspecies and seven forms. The subspecies are as follows:

L. castaneothorax occurs in Tahiti. Apparently, it is descended from L. c. castaneothorax. They are distinguished today by having paler underparts and by the scalloping of the nape extended onto the mantle.

In Australia, the chestnut-breasted mannikin is known as a bird of reed beds and rank grasses bordering rivers, in swamp, in grassy country, and mangroves. It is commonly found in cane fields and cereal crops. In dry seasons, it is seen in arid country but always near water. It is also found in grassy woodland.

John Gould wrote of it (quoted in Cayley, 1932):

I had not the good fourtune to meet with this bird in a state of nature, but I have been informed that it frequents reed beds bordering the banks of rivers and lagoons on the eastern coast, and that it much resembles the Bearded Tit Panurus biarmicus, of Europe in the alertness with which it passes up and down the upright stems of reeds, from the lower part to the very top, a habit for which the lengthened and curved form of its claws seem well adapted.

In New Guinea, the chestnut-breasted mannikin is a bird of drier areas and does not usually seen in jungle roads and clearings where other munias such as grey-headed mannikin are found.

In French Polynesia, it is well established as an introduced species, and its habits have developed somewhat differently, indicating the adaptability of the species. It is widespread on the bracken-covered hill slopes, in pastures and gardens (it is not a garden bird in Australia), on cultivated land and wasteland, in forest ecotones and coconut plantations (Lever 1989).