Whether it is from the photos and video provided by the public, or on the site of the reporter in Shun Yu District, the air indeed has a large number of birds like sparrows flying over, which birds are difficult to accurately judge. Public information shows that the above scenes were reported in the media in 2012, and in 2014 winter, many micro-blog netizens reflected the "blueprint" again. According to the bird experts in Ji'nan, there are two kinds of saying that birds "blot out the sun" in the industry. One is the birds above, the birds are sparrows. The sparrows live in the city all the year. In order to find food more easily in winter, they are "flocks" to perch for food, which can reduce the risk and avoid the attack. The other is the migratory Finch, which often integrates large groups during the migration, sometimes as many as hundreds or thousands of them, which is related to sudden weather, such as sudden cold weather.
the reporter learned that although there were differences in bird subdivision and cluster reasons, it was certain that this phenomenon had nothing to do with symptoms or anomalies.