We were forced to stay a night at the Arun Ras Hotel in Kampong Thom. On waking found the tree opposite my room full of house sparrows and the occasional plain-backed. There must have been between 500-1,000 in this tree. At dawn they started flying off in groups, most towards the floodplain. It must be a lot safer for them to roost in the middle of town than out in the floodplain, or there is just a lack of nice tall trees where they can sit together in the hundreds.