Beijing, November 22 (Youth.cn) - During late autumn to early winter, thousands of migrant birds gather at Qilihai Wetland Natural Reserve in Tianjin, injecting vitality to the region. Tianjin is an important access point on the passage of East Asia - Australia, where migrant birds travel. As an important station on the passage, thousands of migrant birds can be seen in this period of time. Photo/VCG