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The rising water level of Songhua River in Harbin City, northeast China's Heilongjiang Province, has led to a swarm of mayflies propagating there.
The insects have attracted the attention of black-headed gulls, who fly back to the river after the breeding season.
In these pictures. thousands of black-headed gulls hover above the river and feast on a hearty meal of mayflies.
(All images via CFP)
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