Enchanting photos of the Danube blooming

The Danube has bloomed again after a long time. This phenomenon is caused by the swarming of millions of the Danube mayfly or Dunavirág (Ephoron virgo), being a special occasion because this species of mayflies has disappeared from the rivers of Middle-Europe for decades owing to water pollution. Even its larvae have only seldom been found by researchers (Photo: György Kriska).

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