At the beginning of the business, the Qing Taizu Nurhachi was chased by the Ming army. In despair, he lay in a ditch and hid. At this time, a group of crows flew over him and covered him tightly, so they survived, so there was a saying that "crows saved their ancestors." Emperor Taizong of Qing Dynasty was also rescued by crows, so Huang Taiji not only prohibited people from hurting crows, but also set up a "Soren pole" in front of Qingning Palace in Shenyang Forbidden City. "Soren pole" is a traditional Manchu "God pole" for worshipping heaven. It is more than ten feet high and has a bowl at the top, which is specially used to place broken grains for the sacrifice of crows. After the emperor shunzhi entered the customs in the Qing Dynasty, he also set up the Soren Staff in the Forbidden City, which kept the highest sacrifice standard for crows. Tell future generations not to shoot crows, and don't let crows starve to death if they have food. After that, the Qing emperor learned from his ancestors and raised countless crows in the Forbidden City.

2. Road map of leaving early and returning late

According to experience and zoologist's investigation, crows mainly appear in winter in urban areas. They fly out of the city along the central axis of Beijing to the Olympic Park in the morning and fly back to the city in the evening. We drew a "crow map"

As can be seen from the picture, not only the Chang 'an Street Line, but also the Gongzhufen-Wukesong Line, the vicinity of Beijing Normal University, several major business districts and downtown parks are crow settlements. One of the most exaggerated is the Gongzhufen-Wukesong Line. Every winter evening, bird droppings fall from the sky, which is spectacular.

3. The reasons are complicated, which are influenced by vegetation, temperature and human activities. They go out for food during the day and go to the suburbs to avoid the cold at night.

The reasons that affect the distribution of urban birds are very complicated: vegetation, temperature and human activities. Western research shows that vegetation coverage affects more than 50% of urban bird distribution.

Bald crows, big-billed crows and western Western jackdaw are all lovers of big trees, roofs and telephone poles in cities. Street trees, parks and campus trees provide good habitats for crows. In addition, due to the heat island effect caused by human activities, the temperature in the city center is higher than that outside the city. Crows mainly look for corn and urban garbage in winter, go out of the city for food during the day and fly back to the city center at night to avoid the cold in the suburbs.

Crows gather in certain places in the old city.

Why do crows only flock in some parts of the old city, but not in other places with vegetation in the city? This involves cultural traditions and the structure of the old city. In the Qing Dynasty, there were already huge crows in Beijing.

First of all, Manchu people have a complex of "crow and magpie worship". The old city of Beijing used to be the place where Manchu people lived. In the old days, there were many Soren poles in the courtyard of Manchu families, and crows flourished in the Qing Dynasty, which has continued to this day. In addition, crows are omnivores and are quite acceptable to carrion and municipal garbage. Wangfujing, Xidan and other places have long been commercial gathering places, and there are sacrifices in ancestral halls. In the past, Gongzhufen-the chaotic graves around Wukesong, the Iron Lion Grave, Xiaoxitian and Beitaipingzhuang around Beijing Normal University, used to be the cemetery of the Manchu aristocrat Hongxing Erke Daiqing family.