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patchily in temperate to tropical grassland near water of s to ne Asia; w India and Sri Lanka, se Asia to Malay Pen., e, ne China, Philippines, Taiwan, e Siberia and s, c Japan
Nonbreeding Range Subregions
OR, AU : grassy fields of Chagos Arch. and Maldives (wc Indian Ocean), Indian Pen. through Indonesian Arch., Cocos (Keeling), Christmas I. and Ashmore Reef (se Indian Ocean), n WA and n NT (n, nc Australia), Mariana Is. to Palau, Truk, Yap and Marshall Is