I don’t think that most people in the construction trade think about a home after it is built. Many things that we think are architecturally beautiful often can be a haven for animals and birds. The corner in the picture is in a hidden area and birds can build nests and raise their young. Pigeons are generational, raising their young on a home which they will continue to return to forever. Birds like sparrows can take up smaller spaces while pigeons occupy larger spaces, pigeons love corners which allow them to protect their backs. Nobody can sneak up on them like hawks, eagles and other predators.
One of my pet peeves are those closets found in garages. They secure the bottom boards with staples and prevent the termite technicians from accessing the expansion joints. I think the boards would stay in place just by gravity and allow us the ability to pull up the board and drill the slab at the expansion joint. But I’m not a builder or carpenter and they are often mandated by City, County and State code laws. Maybe not directly related to birds or pigeons but an example of building issues associated with homes or sometimes businesses.