A man photographs black-headed gulls on the river bank of Songhua River in Harbin, Northeast China’s Heilongjiang province on Oct 17. As temperatures gradually drop with the arrival of deep autumn, Songhua River receives many migratory birds stopping for food and rest during their migration to warmer areas of southern China to escape the cold from the beginning of October. It forms a beautiful landscape and provides a good opportunity for bird lovers to appreciate birds and for shutterbugs to take photos. [Photo/IC]

Black-headed gulls fly over Songhua River in Harbin, Northeast China’s Heilongjiang province on Oct 17. Currently, about 10,000 black-headed gulls are gathering at Songhua River, the number of gulls is expected to grow with the drop of temperature. Due to the river’s improved ecosystem, Songhua River has become an ideal habitat for migratory birds, and has seen a distinct increase in the number of wild animals over the past few years. [Photo/IC]

A Black-headed gull flies over Songhua River in Harbin, Northeast China’s Heilongjiang province on Oct 17. [Photo/IC]