The viewing deck at Haneda is not a place I had gone to photograph wildlife. However, despite the usual concerns about birds and planes not mixing well, there were a lot of small birds that seemed to be hanging out on the roof of the terminal buildings. I imagine the number of visitors to the viewing decks means there will be crumbs of some sort for them to feed on. They were pretty close to the people but just the other side of the fencing. I guess they knew they were safe.