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Range DescriptionTerpsiphone atrocaudata breeds in the humid forests of southern Honshu, Shikoku, Kyushu and the Nansei Shoto islands in Japan, South Korea, North Korea, Taiwan (China) (including Lanyu Island) and the extreme northern Philippines. The population on Taiwan is largely resident, but all others are fully migratory. Migration route covers parts of mainland China, Hong Kong (China), northern Thailand, central and eastern Laos, Vietnam, Philippines, Malaysia and Singapore. Main wintering areas are in Peninsular Malaysia, northern and western Philippines, and on Sumatra, Indonesia. A recent survey detected a steep decline in part of the Japanese breeding population, although it is still apparently a common breeder on Ryukyu and Batan islands.