The Java sparrow is a small passerine bird. This estrildid finch is a resident breeding bird in Java, Bali and Bawean in Indonesia. It is a popular cage bird, and has been introduced into many other countries. The Java sparrow is about 15 to 17 cm in length from the beak to its tip of tail feathers. Although only about the size of a house sparrow.The adult is unmistakable, with its grey upperparts and breast, pink belly, white-cheeked black head, red eye-ring, pink feet and thick red bill.