The Yellow-bellied Prinia (Prinia flaviventris) is a species of bird in the family Cisticolidae. It is found in Pakistan, the southern Himalayan foothills, the northeastern Indian subcontinent, and Southeast Asia.
Range map from www.oiseaux.net - Ornithological Portal Oiseaux.net
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Description This chestnut brown duck is confusable only with the fulvous whistling duck (D. bicolor) but has chestnut upper-tail coverts unlike the creamy white in the latter. The ring around the eye is orange to yellow. When flying straight, their head is held below the level of the body as in other Dendrocygna species. The crown appears dark and the sexes are alike in plumage.
They fly slowly but with rapid wing-flapping and usually produce a repetitive wheezy seasick call as they circle overhead. They are very nocturnal and often rest during the day. The outermost primary feather has the inner vane modified. They produce very prominent whistling sound while flying.