Which animal has minimum life span?

The Mayfly lives only for an hour (some species live up to 24 hrs., though), that’s the reason it holds the Guinness World Record for being the insect with the shortest lifespan on Earth. So next time when someone you know has a bad day and wants to complain – tell them to think of it like a Mayfly, things could always be worse – they could expire before the day even ends!!!