What is the smallest creature in the world?

The smallest creature in the world is either a virus, if you count microbes that or a fairy fly.A fairy fly is actually a bee but does not sting us.It is under 0.5mm long! If you count smaller-than-microbes,people say an atom is the smallest. this is .not true. atoms are made up of the nucleus, and the electrons. the electrons are made up of even smaller particles called quarks(nothing to do with ducks). However, the quarks are made of smaller particles unknown to man. even though the electrons are made up of quarks, they are made up of gluons as well. these gluons are an elemental element. this means they are not made up of anything else. By the way, a virus is, in fact, alive. here's what it does for a living.......... virus enters cell. it programs the cell to use all it's energy to make more viruses. cell dies. all microbes move onto next victim. virus enters cell. it programs the cell to use all it's energy to make more viruses. cell dies. all microbes move onto next victim. virus enters cell. it programs the cell to use all it's energy to make more viruses. cell dies. all microbes move onto next victim. virus enters cell.........well there you go. special two in one question!!!