When common black-headed gulls migrate across the continent, some "flying fish" fascinated by the sky leap from the water, and they collide at Poyang Lake.

The Yangtze finless porpoises are "hunting partners" to the gulls. With a magical flick of a porpoise's tail, schools of fish are besieged. The gulls are eager to seize the opportunity to get their share.

In the past, over-exploitation of the river sharply reduced their number to critically-endangered status; and witnessing gulls and porpoises in tandem was rare, even for grizzled fishermen. But now things are different. Watch this episode to learn more!

About 'Journeys in Nature': Jiangxi Poyang Lake Series 

Poyang Lake, the largest freshwater lake in China, is an internationally significant wetland. It's the most important winter grounds for migratory birds along the East Asian-Australasian Flyway, and the largest avian winter habitat in Asia. More than 460 bird species have been recorded at Poyang Lake. Every year from October to April, more than 700,000 birds fly here for winter, including more than 98 percent of the world's Siberian cranes and 95 percent of the world's oriental storks. CGTN Nature's film crew traveled to the lake to learn about the special bond between Poyang Lake and migratory birds as well as other creatures. Stay tuned!