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A swarm of mayflies (Ephoron virgo - Ephemeroptera of the Polymitarcyidae family) flies by a boat over the surface of the river Danube after sunset in Szentendre, north of Budapest, Hungary, on August 9, 2022. Mayflies insects disappeared from the big rivers of central Europe due to water pollution in the last 40 years, but they started to return around 2012 as a result of a better quality of the water. Reducing and adapting the artificial street lights on the river bank helped also not to attract the night-swarming mayflies away from the water. (Photo by Ferenc Isza/AFP Photo)
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