With ten thousand known species in the world, ants are believed to outnumber humans about a million to one. But that's not the only seriously impressive fact about these tiny creatures. Worker ants can lift weight twice their size, and their soldiers are studied by U.S. defense analysts. The success of ants as a species is evident in the fact that they've been around for at least 30 million years, and their ability to work together has had perhaps the biggest impact on that success, according to American biologist Edward Osborne Wilson. Compared to humans, who have only roamed Earth for about one million years, ants have proven their success.