Both sexes have long, pointed, cross-barred tail, but the male s tail is much longer.
Body is dark green.
Found in Japan and has been introduced into Hawaii, where pure forms may be found only on the more remote mountain slopes of the island of Hawaii. Prefers park-like country near water, with tall grass, shrubs and occasional trees on which to roost. Feeds primarily on grains, seeds, and berries. The courting season begins as soon as the snow thaws. Early laying females often drop eggs anywhere on the feeding field or in another nest that they encounter on their way to their own .