https://dxnest.com/yen-hu-chung-san/
Sparrows are in trouble - their population has halved for reasons we don't understand. A sparrow bird box offers them a safe, easy to find home and can help boost their numbers. Sparrow nest boxes can be placed under the eaves of houses or high on walls. They should be away from any wires or other structures that could cause a problem. Getting the homeowner's permission is a good idea before placing a nest box in their property. Alternatively, a sparrow box can be mounted on a pole or post in the garden. should face north or east to avoid direct sun