Mayflies, after hatching and then spending one to three years developing as naiads, live only one day as adults. During this single day, they molt twice, mate, and lay eggs in water. Because these adults do not have fully developed mouth parts, they do not feed.
蜉蝣孵化出来后有1---3年作为稚虫生长，作为成虫只活一天。在这一天中它要蜕两次皮，交配，在水中产卵。因为成虫没有发展完好的口器，因而不吃东西。
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