Mayflies, also known as shadflies, are aquatic insects whose immature stage – called ‘naiad’ or ‘nymph’ usually lasts a year in fresh water. However, adult mayflies are short-lived, from a few minutes to a few days, depending on the species. This is because the primary function of an adult mayfly is reproduction.
A particularly strange yet amazing phenomenon related to these facts occurs every year in Russia, on a lake in the Primorye province. Once a year, billions of mayflies converge on the lake to mate, spawn and die… all on the same day. First there are thousands, then millions, then billions.
Watch the video below and be amazed with the billion of mayflies flying around at sunset!