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Freshly hatched mayflies or ephemeras (Palingenia longicauda) crowd the surface of River Tisza near Tiszacsege, 170 kms east of Budapest, Hungary, 10 June 2018. Mayflies are water insects, after the females drop their eggs into the water, the nymphs or naiads spend three years at the bottom of the river before they emerge to the surface. Every year from late spring to early summer a natural spectacle called “Tisza blooming” happens on the surface of River Tisza as the adult insects molt their larva skins. The adult insects take flight, swarming in huge clouds, and after mating, females lay eggs on the river's surface, then both sexes perish in just a few hours. (Photo by Zsolt Czegledi/EPA/EFE)
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