With the weather getting colder, the Yellow River Wetland National Nature Reserve in Luoyang City, Henan Province, has welcomed a large number of migratory birds. So far, more than 60,000 migratory birds have arrived, including black storks, Eurasian spoonbills and whooper swans. How do researchers monitor and patrol the wetlands? What are the new faces in the Yellow River Wetland? Come together to watch the migratory birds wintering.