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In page Javan frogmouth:

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The Javan frogmouth ranges across tropical southeastern Asia. There are three subspecies: B. j. continentalis is found in Cambodia, Laos, Myanmar, Thailand, and Vietnam; B. j. affinis is found in Peninsular Malaysia, Philippines, Sarawak, Sabah, Brunei, Borneo and Sumatra; and B. j. javensis occurs in Java. Its typical habitat is lowland evergreen forest including swampy areas, especially areas with dense undergrowth.[1] It sometimes occurs in deciduous forest, and also in plantations, secondary growth forests and urban parks.[2] Its altitude range is up to at least 800 m (2,600 ft), and it is found higher than this on Java.[1]