Despite appearing early, mayflies are listed as one of the creatures with the shortest lifespan in the world. Its life lasts only 24 hours. They spend most of their time in pupae, about 1-3 years in water. When mayflies are about to dіe, they emerge from their pupae and become adult mayflies.

Mayflies (also known as Canadian mayflies in the United States, and as mayflies or fish in Canada and the American Midwest; also as winged flies in the United Kingdom) are aquatic insects. belongs to the order Ephemeroptera. This order is part of an ancient group of insects called Palaeoptera, which also includes dragonflies and damselflies.

More than 3,000 ѕрeсіeѕ of mayflies are known worldwide, grouped into more than 400 genera in 42 families. Mayflies exhibit some ancestral characteristics that were probably present in the first flying insects, such as long tails and wings that do not fold flat on the abdomen. Their immature stages are freshwater aquatic forms (called “naiads” or “nymphs”), whose presence indicates a clean, unpolluted environment.

They are ᴜпіqᴜe among insects in having a completely winged terrestrial preadult stage, the subimago, which transforms into a sexual adult, the imago. Mayflies “hatch” (emerge as adults) from spring to fall, not necessarily in May, in huge numbers.