Passing through Mumbai airport last week I saw, for the first time, crows inside the huge building. I have seen pigeons inside buildings before, but this was the first time I saw crows. An airport terminal is a closed structure, so it is somewhat strange to see birds inside. One wonders how they get in.
I was reminded of the ingenious Spanish bird’s net: a large net strategically placed to exclude birds. Spanish buildings are open to the air, as Indian buildings are, and for the same reason. Clever circulation of air can cool buildings. A typical Spanish style is a structure built around one or more open courtyards. I noticed that there were seldom any birds inside these buildings. The reason is a net stretched right across the opening at the level of the roof. The mesh is small enough to exclude even the notorious Spanish sparrows!