Striped upper back is a regular feature of many buntings including Chestnut - see this photo of a female Chestnut Bunting from 
www.orientalbirdimages.org
You can compare images of Chestnut and Yellow-breasted Bunting from this website. 
The chestnut rump is a key feature but the size and shape of this bird indicate Chestnut to me rather than Yellow-breasted.
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 Last edited by wgeoff at 30/12/2008 07:36 ]