Wacky and ornamental nest boxes dangerous for young birds, warns RSPB | Birds | The Guardian
Gardman Sparrow Colony Nest Box - Bird Care - Westland Garden Health
House Sparrow nest boxes on a house, England, UK Stock Photo - Alamy
House sparrow (Passer domesticus) perched on a wooden sparrow nesting box with a beak full of insects for feeding chicks during May, UK Stock Photo - Alamy