swallows like to build nests under the eaves of farmers' houses, people have long been used to this, but hundreds of swallows are gathering in urban courtyards. Rare. On the 17 day, in front of a residential building near the East moat, hundreds of swallows were flying here from all directions. Some of the swallows were neatly "sitting in rows" singing laughter on the wire of the dwellings, some flying in the air, forming a beautiful "five line" map. (Wang Feng)