Java sparrows, or Lonchura oryzivora, are birds that spend much time in groups and are part of the munia group.
Both sexes are similar, but immature birds have brown upperparts and paler brown underparts and cheeks. The rest of their head is dark grey rather than black, and the bill is grey with a pink base.
Java sparrows are very gregarious and feed mainly on seeds, especially rice, hence their nickname (rice bird). They also eat invertebrates.
The nest is constructed in a tree or building, and up to eight eggs are laid.