Nepali omithologists on Monday Feb 4, 2008 said they have diserured a new bird, sub speies in Koshi Wildlife Reserve. The new bird is named "Nepal Rufous-vented Prinia" (Prinia burnesil nepalensis). or Prinia burnesii nipalensis scientifically. A team of Nepalese ornithologissts has discovered a new sub-species of bird at Koshi Tappu Wildlife Reserve (KTWR).

Rufous-vented Prinia's other two species are identified. One Prinia burnesii burnesii is found in Pakistan along the tributaries of Indus River and adjacent Punjab in India, and the other Prinia burnesii cinerascens is found in Assam, India along the Bramhaputra river systems and adjoining states of India and Bangladesh.

The new bird recorded in Koshi Tappu shows somewhat intermediate characters between these two subspecies and appears to form a link between them. Experts says that the adult of this newly found subspecies has overall olive-grey to light brown plumage. The head and nape are greyer compared to the browner back, wings and tail. In most individuals, there is faint whitish supercilium which reaches behind the eye. The head is densely streaked compared to back and n the back, the streakings are bolder compared to the ones in head. The juveniles are similar to adults but slightly less marked on the head and body. Light rufous under-tail coverts were visible in one young bird caught.