Quote:
Originally Posted by Paul
Swift Bricks 
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Quote:
a ‘swift brick’ is a brick that sits flush to the wall, with a hole in it, providing nesting habitat for eight species of small urban birds.
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https://www.wildlifetrusts.org/blog/...ome-their-home
Previous holes in houses that some species of bird live in are are being blocked up through insulation and repairs. Birds who depend on such cavities are in sharp decline, including swifts and house sparrows.