Coturnix japonica breeds in eastern Asia, including northern Mongolia, Sakhalin Island and the Baikal and Vitim regions of Russia, north-east China, Japan, North Korea and South Korea. Some populations in Japan are resident, but most birds migrate south, wintering in southern China, Laos, Vietnam, Cambodia, Myanmar, Bhutan and north-east India1. There are also introduced populations in Italy and Hawaii (USA). No reliable population estimate exists, and although the species was previously considered to be fairly common in China1, declines appear to have occurred in Laos2and Japan3,4, and there are fears that the species has undergone a significant decline1,2.
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