mayfly

Mayflies spend a year awaiting their birth, and then most die after living just one day. Their sole purpose is to pass on their genes, and most never even bother eating...and that's been the status quo for 100 million years. Mayflies spend an entire year in freshwater in what's known as a nymph stage, in which the insects already look much like their adult forms but don't actually do anything. After that year, the insects fly off to find a mate, lay some eggs, and promptly die.