"It is a simple idea of PVC pipes being used where artificial nesting spaces have been created. Each unit has three nesting spaces almost like three compartments/three rooms for three nests," Ahmed said.
He added that the length of the pipe is 2.5 feet and internal width is 4 inches, big enough for sparrows, robins and even squirrels to nest in.
The units are waterproof, rainproof and dustproof. They have a life of about 25 plus years.